/mandos/trunk : revision 416

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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from __future__ import division, absolute_import, with_statement

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import sys

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import os

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import signal

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import datetime

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import urwid.curses_display

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import urwid

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from dbus.mainloop.glib import DBusGMainLoop

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import gobject

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import dbus

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import UserList

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import locale

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locale.setlocale(locale.LC_ALL, u'')

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# Some useful constants

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domain = 'se.bsnet.fukt'

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server_interface = domain + '.Mandos'

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client_interface = domain + '.Mandos.Client'

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version = "1.0.14"

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# Always run in monochrome mode

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urwid.curses_display.curses.has_colors = lambda : False

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# Urwid doesn't support blinking, but we want it. Since we have no

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# use for underline on its own, we make underline also always blink.

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urwid.curses_display.curses.A_UNDERLINE |= (

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urwid.curses_display.curses.A_BLINK)

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class MandosClientPropertyCache(object):

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"""This wraps a Mandos Client D-Bus proxy object, caches the

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properties and calls a hook function when any of them are

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changed.

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"""

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def __init__(self, proxy_object=None, *args, **kwargs):

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self.proxy = proxy_object # Mandos Client proxy object

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self.properties = dict()

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self.proxy.connect_to_signal(u"PropertyChanged",

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self.property_changed,

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client_interface,

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byte_arrays=True)

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self.properties.update(

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self.proxy.GetAll(client_interface,

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dbus_interface = dbus.PROPERTIES_IFACE))

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super(MandosClientPropertyCache, self).__init__(

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proxy_object=proxy_object, *args, **kwargs)

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def property_changed(self, property=None, value=None):

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"""This is called whenever we get a PropertyChanged signal

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It updates the changed property in the "properties" dict.

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"""

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# Update properties dict with new value

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self.properties[property] = value

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class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):

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"""A Mandos Client which is visible on the screen.

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"""

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def __init__(self, server_proxy_object=None, update_hook=None,

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delete_hook=None, logger=None, *args, **kwargs):

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# Called on update

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self.update_hook = update_hook

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# Called on delete

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self.delete_hook = delete_hook

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# Mandos Server proxy object

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self.server_proxy_object = server_proxy_object

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# Logger

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self.logger = logger

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# The widget shown normally

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self._text_widget = urwid.Text(u"")

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# The widget shown when we have focus

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self._focus_text_widget = urwid.Text(u"")

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super(MandosClientWidget, self).__init__(

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update_hook=update_hook, delete_hook=delete_hook,

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*args, **kwargs)

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self.update()

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self.opened = False

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self.proxy.connect_to_signal(u"CheckerCompleted",

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self.checker_completed,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"CheckerStarted",

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self.checker_started,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"GotSecret",

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self.got_secret,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"Rejected",

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self.rejected,

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client_interface,

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byte_arrays=True)

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def checker_completed(self, exitstatus, condition, command):

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if exitstatus == 0:

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self.logger(u'Checker for client %s (command "%s")'

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u' was successful'

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% (self.properties[u"name"], command))

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return

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if os.WIFEXITED(condition):

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self.logger(u'Checker for client %s (command "%s")'

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u' failed with exit code %s'

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% (self.properties[u"name"], command,

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os.WEXITSTATUS(condition)))

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return

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if os.WIFSIGNALED(condition):

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self.logger(u'Checker for client %s (command "%s")'

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u' was killed by signal %s'

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% (self.properties[u"name"], command,

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os.WTERMSIG(condition)))

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return

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if os.WCOREDUMP(condition):

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self.logger(u'Checker for client %s (command "%s")'

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u' dumped core'

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% (self.properties[u"name"], command))

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self.logger(u'Checker for client %s completed mysteriously')

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def checker_started(self, command):

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self.logger(u'Client %s started checker "%s"'

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% (self.properties[u"name"], unicode(command)))

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def got_secret(self):

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self.logger(u'Client %s received its secret'

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% self.properties[u"name"])

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def rejected(self):

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self.logger(u'Client %s was rejected'

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% self.properties[u"name"])

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def selectable(self):

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"""Make this a "selectable" widget.

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This overrides the method from urwid.FlowWidget."""

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return True

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def rows(self, (maxcol,), focus=False):

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"""How many rows this widget will occupy might depend on

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whether we have focus or not.

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This overrides the method from urwid.FlowWidget"""

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return self.current_widget(focus).rows((maxcol,), focus=focus)

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def current_widget(self, focus=False):

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if focus or self.opened:

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return self._focus_widget

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return self._widget

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def update(self):

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"Called when what is visible on the screen should be updated."

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# How to add standout mode to a style

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with_standout = { u"normal": u"standout",

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u"bold": u"bold-standout",

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u"underline-blink":

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u"underline-blink-standout",

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u"bold-underline-blink":

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u"bold-underline-blink-standout",

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}

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# Rebuild focus and non-focus widgets using current properties

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self._text = (u'%(name)s: %(enabled)s'

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% { u"name": self.properties[u"name"],

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u"enabled":

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(u"enabled"

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if self.properties[u"enabled"]

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else u"DISABLED")})

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if not urwid.supports_unicode():

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self._text = self._text.encode("ascii", "replace")

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textlist = [(u"normal", self._text)]

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self._text_widget.set_text(textlist)

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self._focus_text_widget.set_text([(with_standout[text[0]],

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text[1])

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if isinstance(text, tuple)

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else text

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for text in textlist])

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self._widget = self._text_widget

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self._focus_widget = urwid.AttrWrap(self._focus_text_widget,

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"standout")

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# Run update hook, if any

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if self.update_hook is not None:

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self.update_hook()

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def delete(self):

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if self.delete_hook is not None:

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self.delete_hook(self)

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def render(self, (maxcol,), focus=False):

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"""Render differently if we have focus.

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This overrides the method from urwid.FlowWidget"""

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return self.current_widget(focus).render((maxcol,),

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focus=focus)

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def keypress(self, (maxcol,), key):

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"""Handle keys.

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This overrides the method from urwid.FlowWidget"""

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if key == u"e" or key == u"+":

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self.proxy.Enable()

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elif key == u"d" or key == u"-":

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self.proxy.Disable()

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elif key == u"r" or key == u"_" or key == u"ctrl k":

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self.server_proxy_object.RemoveClient(self.proxy

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.object_path)

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elif key == u"s":

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self.proxy.StartChecker()

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elif key == u"S":

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self.proxy.StopChecker()

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elif key == u"C":

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self.proxy.CheckedOK()

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# xxx

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# elif key == u"p" or key == "=":

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# self.proxy.pause()

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# elif key == u"u" or key == ":":

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# self.proxy.unpause()

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# elif key == u"RET":

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# self.open()

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else:

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return key

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def property_changed(self, property=None, value=None,

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*args, **kwargs):

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"""Call self.update() if old value is not new value.

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This overrides the method from MandosClientPropertyCache"""

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property_name = unicode(property)

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old_value = self.properties.get(property_name)

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super(MandosClientWidget, self).property_changed(

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property=property, value=value, *args, **kwargs)

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if self.properties.get(property_name) != old_value:

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self.update()

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class ConstrainedListBox(urwid.ListBox):

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"""Like a normal urwid.ListBox, but will consume all "up" or

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"down" key presses, thus not allowing any containing widgets to

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use them as an excuse to shift focus away from this widget.

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"""

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def keypress(self, (maxcol, maxrow), key):

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ret = super(ConstrainedListBox, self).keypress((maxcol, maxrow), key)

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if ret in (u"up", u"down"):

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return

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return ret

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class UserInterface(object):

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"""This is the entire user interface - the whole screen

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with boxes, lists of client widgets, etc.

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"""

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def __init__(self, max_log_length=1000):

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DBusGMainLoop(set_as_default=True)

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self.screen = urwid.curses_display.Screen()

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self.screen.register_palette((

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(u"normal",

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u"default", u"default", None),

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(u"bold",

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u"default", u"default", u"bold"),

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(u"underline-blink",

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u"default", u"default", u"underline"),

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(u"standout",

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u"default", u"default", u"standout"),

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(u"bold-underline-blink",

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u"default", u"default", (u"bold", u"underline")),

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(u"bold-standout",

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u"default", u"default", (u"bold", u"standout")),

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(u"underline-blink-standout",

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u"default", u"default", (u"underline", u"standout")),

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(u"bold-underline-blink-standout",

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u"default", u"default", (u"bold", u"underline",

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u"standout")),

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))

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if urwid.supports_unicode():

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self.divider = u"─" # \u2500

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#self.divider = u"━" # \u2501

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else:

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#self.divider = u"-" # \u002d

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self.divider = u"_" # \u005f

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self.screen.start()

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self.size = self.screen.get_cols_rows()

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self.clients = urwid.SimpleListWalker([])

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self.clients_dict = {}

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# We will add Text widgets to this list

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self.log = []

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self.max_log_length = max_log_length

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# We keep a reference to the log widget so we can remove it

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# from the ListWalker without it getting destroyed

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self.logbox = ConstrainedListBox(self.log)

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# This keeps track of whether self.uilist currently has

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# self.logbox in it or not

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self.log_visible = True

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self.log_wrap = u"any"

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self.rebuild()

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self.log_message_raw((u"bold",

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u"Mandos Monitor version " + version))

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self.log_message_raw((u"bold",

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u"q: Quit ?: Help"))

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self.busname = domain + '.Mandos'

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self.main_loop = gobject.MainLoop()

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self.bus = dbus.SystemBus()

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mandos_dbus_objc = self.bus.get_object(

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self.busname, u"/", follow_name_owner_changes=True)

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self.mandos_serv = dbus.Interface(mandos_dbus_objc,

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dbus_interface

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= server_interface)

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try:

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mandos_clients = (self.mandos_serv

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.GetAllClientsWithProperties())

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except dbus.exceptions.DBusException:

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mandos_clients = dbus.Dictionary()

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(self.mandos_serv

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.connect_to_signal(u"ClientRemoved",

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self.find_and_remove_client,

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dbus_interface=server_interface,

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byte_arrays=True))

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(self.mandos_serv

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.connect_to_signal(u"ClientAdded",

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self.add_new_client,

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dbus_interface=server_interface,

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byte_arrays=True))

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(self.mandos_serv

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.connect_to_signal(u"ClientNotFound",

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self.client_not_found,

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dbus_interface=server_interface,

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byte_arrays=True))

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for path, client in mandos_clients.iteritems():

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client_proxy_object = self.bus.get_object(self.busname,

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path)

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self.add_client(MandosClientWidget(server_proxy_object

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=self.mandos_serv,

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proxy_object

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=client_proxy_object,

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properties=client,

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update_hook

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=self.refresh,

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delete_hook

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=self.remove_client,

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logger

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=self.log_message),

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path=path)

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def client_not_found(self, fingerprint, address):

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self.log_message((u"Client with address %s and fingerprint %s"

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u" could not be found" % (address,

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fingerprint)))

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def rebuild(self):

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"""This rebuilds the User Interface.

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Call this when the widget layout needs to change"""

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self.uilist = []

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#self.uilist.append(urwid.ListBox(self.clients))

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self.uilist.append(urwid.Frame(ConstrainedListBox(self.clients),

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#header=urwid.Divider(),

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header=None,

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footer=urwid.Divider(div_char=self.divider)))

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if self.log_visible:

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self.uilist.append(self.logbox)

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pass

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self.topwidget = urwid.Pile(self.uilist)

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def log_message(self, message):

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timestamp = datetime.datetime.now().isoformat()

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self.log_message_raw(timestamp + u": " + message)

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def log_message_raw(self, markup):

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"""Add a log message to the log buffer."""

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self.log.append(urwid.Text(markup, wrap=self.log_wrap))

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if (self.max_log_length

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and len(self.log) > self.max_log_length):

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del self.log[0:len(self.log)-self.max_log_length-1]

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self.logbox.set_focus(len(self.logbox.body.contents),

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coming_from=u"above")

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self.refresh()

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def toggle_log_display(self):

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"""Toggle visibility of the log buffer."""

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self.log_visible = not self.log_visible

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self.rebuild()

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self.log_message(u"Log visibility changed to: "

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+ unicode(self.log_visible))

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def change_log_display(self):

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"""Change type of log display.

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Currently, this toggles wrapping of text lines."""

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if self.log_wrap == u"clip":

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self.log_wrap = u"any"

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else:

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self.log_wrap = u"clip"

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for textwidget in self.log:

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textwidget.set_wrap_mode(self.log_wrap)

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self.log_message(u"Wrap mode: " + self.log_wrap)

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def find_and_remove_client(self, path, name):

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"""Find an client from its object path and remove it.

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This is connected to the ClientRemoved signal from the

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Mandos server object."""

418

try:

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client = self.clients_dict[path]

420

except KeyError:

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# not found?

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return

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self.remove_client(client, path)

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def add_new_client(self, path):

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client_proxy_object = self.bus.get_object(self.busname, path)

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self.add_client(MandosClientWidget(server_proxy_object

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=self.mandos_serv,

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proxy_object

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=client_proxy_object,

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update_hook

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=self.refresh,

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delete_hook

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=self.remove_client,

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logger

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=self.log_message),

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path=path)

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def add_client(self, client, path=None):

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self.clients.append(client)

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if path is None:

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path = client.proxy.object_path

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self.clients_dict[path] = client

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self.clients.sort(None, lambda c: c.properties[u"name"])

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self.refresh()

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def remove_client(self, client, path=None):

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self.clients.remove(client)

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if path is None:

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path = client.proxy.object_path

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del self.clients_dict[path]

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if not self.clients_dict:

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# Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker

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# is completely emptied, we need to recreate it.

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self.clients = urwid.SimpleListWalker([])

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self.rebuild()

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self.refresh()

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def refresh(self):

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"""Redraw the screen"""

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canvas = self.topwidget.render(self.size, focus=True)

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self.screen.draw_screen(self.size, canvas)

463

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def run(self):

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"""Start the main loop and exit when it's done."""

466

self.refresh()

467

self._input_callback_tag = (gobject.io_add_watch

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(sys.stdin.fileno(),

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gobject.IO_IN,

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self.process_input))

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self.main_loop.run()

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# Main loop has finished, we should close everything now

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gobject.source_remove(self._input_callback_tag)

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self.screen.stop()

475

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def stop(self):

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self.main_loop.quit()

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def process_input(self, source, condition):

480

keys = self.screen.get_input()

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translations = { u"ctrl n": u"down", # Emacs

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u"ctrl p": u"up", # Emacs

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u"ctrl v": u"page down", # Emacs

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u"meta v": u"page up", # Emacs

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u" ": u"page down", # less

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u"f": u"page down", # less

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u"b": u"page up", # less

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u"j": u"down", # vi

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u"k": u"up", # vi

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}

491

for key in keys:

492

try:

493

key = translations[key]

494

except KeyError: # :-)

495

pass

496

497

if key == u"q" or key == u"Q":

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self.stop()

499

break

500

elif key == u"window resize":

501

self.size = self.screen.get_cols_rows()

502

self.refresh()

503

elif key == u"\f": # Ctrl-L

504

self.refresh()

505

elif key == u"l" or key == u"D":

506

self.toggle_log_display()

507

self.refresh()

508

elif key == u"w" or key == u"i":

509

self.change_log_display()

510

self.refresh()

511

elif key == u"?" or key == u"f1" or key == u"esc":

512

if not self.log_visible:

513

self.log_visible = True

514

self.rebuild()

515

self.log_message_raw((u"bold",

516

u" ".

517

join((u"q: Quit",

518

u"?: Help",

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u"l: Log window toggle",

520

u"TAB: Switch window",

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u"w: Wrap (log)"))))

522

self.log_message_raw((u"bold",

523

u" "

524

.join((u"Clients:",

525

u"e: Enable",

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u"d: Disable",

527

u"r: Remove",

528

u"s: Start new checker",

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u"S: Stop checker",

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u"C: Checker OK"))))

531

self.refresh()

532

elif key == u"tab":

533

if self.topwidget.get_focus() is self.logbox:

534

self.topwidget.set_focus(0)

535

else:

536

self.topwidget.set_focus(self.logbox)

537

self.refresh()

538

#elif (key == u"end" or key == u"meta >" or key == u"G"

539

# or key == u">"):

540

# pass # xxx end-of-buffer

541

#elif (key == u"home" or key == u"meta <" or key == u"g"

542

# or key == u"<"):

543

# pass # xxx beginning-of-buffer

544

#elif key == u"ctrl e" or key == u"$":

545

# pass # xxx move-end-of-line

546

#elif key == u"ctrl a" or key == u"^":

547

# pass # xxx move-beginning-of-line

548

#elif key == u"ctrl b" or key == u"meta (" or key == u"h":

549

# pass # xxx left

550

#elif key == u"ctrl f" or key == u"meta )" or key == u"l":

551

# pass # xxx right

552

#elif key == u"a":

553

# pass # scroll up log

554

#elif key == u"z":

555

# pass # scroll down log

556

elif self.topwidget.selectable():

557

self.topwidget.keypress(self.size, key)

558

self.refresh()

559

return True

560

561

ui = UserInterface()

562

try:

563

ui.run()

564

except Exception, e:

565

ui.log_message(unicode(e))

566

ui.screen.stop()

567

raise