#!/usr/bin/python2.6
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010  Joanna Rutkowska <joanna@invisiblethingslab.com>
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
#

from optparse import OptionParser
import subprocess
import shutil
import re


def find_net_devices():
    p = subprocess.Popen (["lspci", "-mm", "-n"], stdout=subprocess.PIPE)
    result = p.communicate()
    retcode = p.returncode
    if (retcode != 0):
        print "ERROR when executing lspci!"
        raise IOError

    net_devices = set()
    rx_netdev = re.compile (r"^([0-9a-f][0-9a-f]:[0-9a-f][0-9a-f].[0-9]) \"02")
    for dev in str(result[0]).splitlines():
        match = rx_netdev.match (dev)
        if match is not None:
            dev_bdf = match.group(1)
            assert dev_bdf is not None
            net_devices.add (dev_bdf)

    return  net_devices

def main():
    usage = "usage: %prog [options] <netvm-name>"
    parser = OptionParser (usage)
    parser.add_option ("-v", "--verbose", dest="verbose", action="store_true", default=False)
    (options, args) = parser.parse_args ()

    if options.verbose:
        print "Loading Xen PCI Backend..."
    retcode = subprocess.call (["/sbin/modprobe", "xen-pciback"])
    if retcode != 0:
        retcode = subprocess.call (["/sbin/modprobe", "pciback"])
        if retcode != 0:
            print "ERROR: Cannot load xen-pciback module!"
            exit(1)

    if options.verbose:
        print "Unbinding the following net devices:"

    net_devices = find_net_devices()

    for dev in net_devices:
        if options.verbose:
            print "--> {0}".format(dev)
        retcode = subprocess.call (["/usr/lib/qubes/unbind_pci_device.sh", dev])
        if (retcode != 0):
            print "WARNING: Could not unbind device {0}".format(dev)


main()