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278 lines
10 KiB
278 lines
10 KiB
#
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# vnc.py: VNC related installer functionality
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#
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# Copyright (C) 2004, 2007 Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Jeremy Katz <katzj@redhat.com>
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#
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import os, sys
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import time
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from pyanaconda import network, product, iutil
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import socket
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import subprocess
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import dbus
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from pyanaconda.i18n import _, P_
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from pyanaconda.ui.tui.simpleline import App
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from pyanaconda.ui.tui.spokes.askvnc import VNCPassSpoke
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import logging
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log = logging.getLogger("anaconda")
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stdoutLog = logging.getLogger("anaconda.stdout")
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XVNC_BINARY_NAME = "Xvnc"
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def shutdownServer():
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"""Try to shutdown any running XVNC server
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Why is this function on the module level and not in the VncServer class ?
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As the server needs to be killed from the exit handler, it would have
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to somehow get to the VncServer instance. Like this, it can just kill
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it by calling a function of the vnc module.
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"""
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try:
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iutil.execWithCapture("killall", [XVNC_BINARY_NAME])
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log.info("The XVNC server has been shut down.")
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except OSError as e:
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log.error("Shutdown of the XVNC server failed with exception:\n%s", e)
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class VncServer:
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def __init__(self, display="1", root="/", ip=None, name=None,
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password="", vncconnecthost="",
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vncconnectport="", log_file="/tmp/vncserver.log",
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pw_file="/tmp/vncpassword"):
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self.display = display
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self.root = root
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self.ip = ip
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self.name = name
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self.password = password
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self.vncconnecthost = vncconnecthost
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self.vncconnectport = vncconnectport
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self.log_file = log_file
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self.pw_file = pw_file
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self.connxinfo = None
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self.anaconda = None
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self.log = logging.getLogger("anaconda.stdout")
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self.desktop = _("%(productName)s %(productVersion)s installation")\
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% {'productName': product.productName,
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'productVersion': product.productVersion}
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def setVNCPassword(self):
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"""Set the vnc server password. Output to file. """
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r, w = os.pipe()
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os.write(w, "%s\n" % self.password)
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with open(self.pw_file, "w") as pw_file:
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# the -f option makes sure vncpasswd does not ask for the password again
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rc = iutil.execWithRedirect("vncpasswd", ["-f"],
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stdin=r, stdout=pw_file)
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os.close(r)
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os.close(w)
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return rc
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def initialize(self):
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"""Here is were all the relative vars get initialized. """
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# Network may be slow. Try for 5 seconds
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tries = 5
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while tries:
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self.ip = network.getFirstRealIP()
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if self.ip:
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break
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time.sleep(1)
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tries -= 1
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if not self.ip:
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return
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ipstr = self.ip
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try:
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hinfo = socket.gethostbyaddr(ipstr)
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except socket.herror as e:
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log.debug("Exception caught trying to get host name of %s: %s", ipstr, e)
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self.name = network.getHostname()
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else:
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if len(hinfo) == 3:
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self.name = hinfo[0]
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if self.ip.find(':') != -1:
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ipstr = "[%s]" % (self.ip,)
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if (self.name is not None) and (not self.name.startswith('localhost')) and (ipstr is not None):
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self.connxinfo = "%s:%s (%s:%s)" % (socket.getfqdn(name=self.name), self.display, ipstr, self.display)
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elif ipstr is not None:
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self.connxinfo = "%s:%s" % (ipstr, self.display,)
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else:
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self.connxinfo = None
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# figure out product info
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if self.name is not None:
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self.desktop = _("%(productName)s %(productVersion)s installation "
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"on host %(name)s") \
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% {'productName': product.productName,
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'productVersion': product.productVersion,
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'name': self.name}
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def openlogfile(self):
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try:
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fd = os.open(self.log_file, os.O_RDWR | os.O_CREAT)
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except OSError as e:
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sys.stderr.write("error opening %s: %s\n", (self.log_file, e))
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fd = None
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return fd
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def connectToView(self):
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"""Attempt to connect to self.vncconnecthost"""
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maxTries = 10
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self.log.info(_("Attempting to connect to vnc client on host %s...") % (self.vncconnecthost,))
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if self.vncconnectport != "":
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hostarg = self.vncconnecthost + ":" + self.vncconnectport
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else:
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hostarg = self.vncconnecthost
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vncconfigcommand = [self.root+"/usr/bin/vncconfig", "-display", ":%s"%self.display, "-connect", hostarg]
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for _i in range(maxTries):
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vncconfp = subprocess.Popen(vncconfigcommand, stdout=subprocess.PIPE, stderr=subprocess.PIPE) # vncconfig process
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err = vncconfp.communicate()[1]
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if err == '':
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self.log.info(_("Connected!"))
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return True
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elif err.startswith("connecting") and err.endswith("failed\n"):
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self.log.info(_("Will try to connect again in 15 seconds..."))
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time.sleep(15)
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continue
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else:
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log.critical(err)
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sys.exit(1)
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self.log.error(P_("Giving up attempting to connect after %d try!\n",
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"Giving up attempting to connect after %d tries!\n",
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maxTries) % (maxTries,))
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return False
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def VNCListen(self):
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"""Put the server in listening mode.
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We dont really have to do anything for the server to listen :)
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"""
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if self.connxinfo != None:
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self.log.info(_("Please manually connect your vnc client to %s to begin the install.") % (self.connxinfo,))
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else:
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self.log.info(_("Please manually connect your vnc client to <IP ADDRESS>:%s "
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"to begin the install. Switch to the shell (Ctrl-B 2) and "
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"run 'ip addr' to find the <IP ADDRESS>.") % (self.display,))
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def startServer(self):
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self.log.info(_("Starting VNC..."))
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network.wait_for_connectivity()
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# Lets call it from here for now.
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try:
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self.initialize()
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except (socket.herror, dbus.DBusException, ValueError) as e:
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stdoutLog.critical("Could not initialize the VNC server: %s", e)
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sys.exit(1)
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if self.password and len(self.password) < 6:
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self.changeVNCPasswdWindow()
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if not self.password:
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SecurityTypes = "None"
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rfbauth = "0"
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else:
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SecurityTypes = "VncAuth"
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rfbauth = self.pw_file
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# Create the password file.
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self.setVNCPassword()
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# Lets start the xvnc.
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xvnccommand = [ XVNC_BINARY_NAME, ":%s" % self.display,
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"-depth", "16", "-br",
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"IdleTimeout=0", "-auth", "/dev/null", "-once",
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"DisconnectClients=false", "desktop=%s" % (self.desktop,),
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"SecurityTypes=%s" % SecurityTypes, "rfbauth=%s" % rfbauth ]
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try:
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xvncp = subprocess.Popen(xvnccommand, stdout=self.openlogfile(), stderr=subprocess.STDOUT)
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except OSError:
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stdoutLog.critical("Could not start the VNC server. Aborting.")
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sys.exit(1)
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# Lets give the xvnc time to initialize
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time.sleep(1)
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# Make sure it hasn't blown up
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if xvncp.poll() != None:
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sys.exit(1)
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else:
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self.log.info(_("The VNC server is now running."))
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# Lets tell the user what we are going to do.
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if self.vncconnecthost != "":
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self.log.warning(_("\n\nYou chose to connect to a listening vncviewer. \n"
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"This does not require a password to be set. If you \n"
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"set a password, it will be used in case the connection \n"
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"to the vncviewer is unsuccessful\n\n"))
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elif self.password == "":
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self.log.warning(_("\n\nWARNING!!! VNC server running with NO PASSWORD!\n"
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"You can use the vncpassword=<password> boot option\n"
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"if you would like to secure the server.\n\n"))
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elif self.password != "":
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self.log.warning(_("\n\nYou chose to execute vnc with a password. \n\n"))
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else:
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self.log.warning(_("\n\nUnknown Error. Aborting. \n\n"))
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sys.exit(1)
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# Lets try to configure the vnc server to whatever the user specified
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if self.vncconnecthost != "":
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connected = self.connectToView()
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if not connected:
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self.VNCListen()
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else:
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self.VNCListen()
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os.environ["DISPLAY"]=":%s" % self.display
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def changeVNCPasswdWindow(self):
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""" Change the password to a sane parameter.
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We ask user to input a password that len(password) > 6
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or password == ''.
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"""
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message = _("VNC password provided was not at least 6 characters long.\n"
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"Please enter a new one. Leave blank for no password.")
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app = App("VNC PASSWORD")
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spoke = VNCPassSpoke(app, self.anaconda.ksdata, None, None, None,
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message)
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app.schedule_screen(spoke)
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app.run()
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self.password = self.anaconda.ksdata.vnc.password
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