/usr/share/pyshared/ControlAula/Plugins/VNC.py is in ltsp-controlaula 1.8.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -*- coding: utf-8 -*-
# Project: Controlaula
# Module: VNC.py
# Purpose: Module to manage VNC server and client
# Language: Python 2.5
# Date: 22-Dic-2009.
# Ver.: 4-Feb-2010.
# Copyright: 2009-2010 - José L. Redrejo RodrÃguez <jredrejo @nospam@ debian.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This modules needs x11vnc, xvncviewer and scrot to work
##############################################################################
import subprocess,os,logging,tempfile
from ControlAula.Utils import MyUtils,NetworkUtils,crippled_des
from signal import SIGTERM,SIGKILL
class VNC(object):
'''
It needs x11vnc and xvnc4viewer to work on Linux
'''
def __init__(self,readonly=True,readpasswd='',writepasswd='',clientport=5400):
'''
Parameters:
readonly=True if the server won't allow keyboard and mouse control
readpasswd= passwd to use when not controlling keyboard and mouse
writepasswd= passwd to use when controlling keyboard and mouse
clientport=the port the client has to use to connect to a VNC server
'''
if readpasswd=='':
self.readPasswd=MyUtils.generateUUID()
else:
self.readPasswd=readpasswd
if writepasswd=='':
self.writePasswd=MyUtils.generateUUID()
else:
self.writePasswd=writepasswd
self.isLTSP=MyUtils.isLTSP()
if self.isLTSP=='':
self.port=str(NetworkUtils.getUsableTCPPort('127.0.0.1',5400))
else:
d=self.isLTSP.split('.')
if len(d)<4: #sometimes, it needs two tries :(
d=self.isLTSP.split('.')
self.port=str(5400 + int(d[3]))
self.readonly=readonly
self.procServer=None
self.clientport=clientport
self.myteacher=None
self.mylogin=MyUtils.getLoginName()
self.myIP=''
self.activeBB=False
def __del__(self):
self.stop()
def startServer(self):
try:
if self.procServer==None:
if self.readonly:
self.procServer=subprocess.Popen(['x11vnc', '-shared', '-forever', '-noxdamage','-noncache', '-passwd', self.writePasswd, '-viewpasswd', self.readPasswd,'-rfbport',self.port])
else:
if self.isLTSP=='':
self.procServer=subprocess.Popen(['x11vnc', '-forever','-ncache','10','-rfbport', self.port, '-passwd', self.writePasswd])
else:
self.procServer=subprocess.Popen(['x11vnc', '-forever', '-noxdamage', '-ncache','10', '-noshm', '-rfbport', self.port, '-passwd', self.writePasswd])
except:
logging.getLogger().error('x11vnc is not working in this system')
if not self.readonly:
self.screenshot()
def screenshot(self):
from twisted.internet import reactor
import xmlrpclib
screenshot_thumb=os.path.join( MyUtils.getHomeUser(),'.controlaula/vnc-thumb.png')
if MyUtils.snapshot(screenshot_thumb):
try:
f = xmlrpclib.Binary(open(screenshot_thumb, 'rb').read())
self.myteacher.screenshot(self.mylogin,self.myIP,f)
except:
logging.getLogger().error('The user %s could not send its photo' % (self.mylogin))
if self.activeBB:
reactor.callLater(5, self.screenshot)
def startROViewer(self,target):
from random import randrange
from twisted.internet import reactor
delay=randrange(25,60)/10.0
reactor.callLater(delay,self.startdelayedViewer,target)
def startdelayedViewer(self,target):
passwd=tempfile.mkstemp()[1]
self.createVNCPassword(self.readPasswd, passwd)
command='xvncviewer -UseLocalCursor=0 -LowColourLevel=1 -ViewOnly -MenuKey Super_R -Shared -Fullscreen -passwd '
command += passwd
command += ' ' + target +':' + self.clientport
self.procViewer=MyUtils.launchAsNobody(command)
MyUtils.dpms_on()
def startViewer(self,target,ltsp,ip):
port=5400
if ltsp:
d=ip.split('.')
port=str(5400 + int(d[3]))
ip='127.0.0.1'
passwd=tempfile.mkstemp()[1]
self.createVNCPassword(self.writePasswd , passwd)
command=['xvncviewer','-UseLocalCursor','0','-LowColourLevel','1',' -Shared']
command +=['-passwd',passwd ]
command +=[ip+':'+str(port),'-name',target]
self.procViewer=subprocess.Popen(command)
def stop(self):
try:
#self.procServer.terminate(): not available in python 2.5
pid=self.procServer.pid
self.procServer=None
os.kill(pid, SIGKILL)
except:
pass
subprocess.Popen(['killall','-9','x11vnc'])
subprocess.Popen(['killall','-9','xvncviewer'])
subprocess.Popen(['killall','-9','xvnc4viewer'])
def getData(self):
return (self.readPasswd,self.writePasswd,self.port)
def createVNCPassword(self, passwd,file):
"""
createVNCPassword("micasa","/tmp/vnc")
"""
#
# We use a fixed key to store passwords, since we assume that our local
# file system is secure but nonetheless don't want to store passwords
# as plaintext.
#
fixedKey = "\x17Rk\x06#NX\x07"
pw = (passwd + '\0' * 8)[:8] #make sure its 8 chars long, zero padded
des = crippled_des.DesCipher(fixedKey)
response = des.encrypt(pw)
f = open(file, "w")
f.write(response)
f.close()
try:
os.chown(file,65534,0)
except:
pass #it will only work when it's executed by sirvecole
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