#!/usr/bin/python2.6
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010  Joanna Rutkowska <joanna@invisiblethingslab.com>
# Copyright (C) 2010  Rafal Wojtczuk  <rafal@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 qubes.qubes import QubesVmCollection
from qubes.qubes import QubesException
from optparse import OptionParser
import subprocess
import socket
import errno
import dbus
import time
import os
import os.path

qubes_guid_path = "/usr/bin/qubes_guid"
qubes_clipd_path = "/usr/bin/qclipd"
qrexec_client_path = "/usr/lib/qubes/qrexec_client"
notify_object = None

# how long (in sec) to wait for VMs to shutdown
# before killing them (when used with --wait option)
shutdown_counter_max =  30

def tray_notify(str, label, timeout = 3000):
    notify_object.Notify("Qubes", 0, label.icon, "Qubes", str, [], [], timeout, dbus_interface="org.freedesktop.Notifications")

def tray_notify_error(str, timeout = 3000):
    notify_object.Notify("Qubes", 0, "dialog-error", "Qubes", str, [], [], timeout, dbus_interface="org.freedesktop.Notifications")

def actually_execute(domid, cmd, options):
    args = [qrexec_client_path, "-d", domid, cmd]
    if options.localcmd is not None:
        args += [ "-l", options.localcmd]
    if options.passio and not options.run_on_all_running:
        os.execv(qrexec_client_path, args)
        exit(1)
    args += ["-e"]
    subprocess.call(args)

def start_guid(vm, options):
    if options.verbose:
        print "--> Starting Qubes GUId..."
    xid = vm.get_xid()

    retcode = subprocess.call ([qubes_guid_path, "-d", str(xid), "-c", vm.label.color, "-i", vm.label.icon, "-l", str(vm.label.index)])
    if (retcode != 0) :
        print "ERROR: Cannot start qubes_guid!"
        if options.tray:
            tray_notify_error ("ERROR: Cannot start qubes_guid!")
        exit (1)

    if options.verbose:
        print "--> Waiting for qubes-session..."

    subprocess.call([qrexec_client_path, "-d", str(xid), "user:echo $$ >> /tmp/qubes-session-waiter; [ ! -f /tmp/qubes-session-env ] && exec sleep 365d"])


def vm_run_cmd(vm, cmd, options):
    if options.shutdown:
        if options.verbose:
            print "Shutting down VM: '{0}'...".format(vm.name)
        subprocess.call (["/usr/sbin/xl", "shutdown", vm.name])
        return

    if options.pause:
        if options.verbose:
            print "Pausing VM: '{0}'...".format(vm.name)
        subprocess.call (["/usr/sbin/xl", "pause", vm.name])
        return

    if options.unpause:
        if options.verbose:
            print "UnPausing VM: '{0}'...".format(vm.name)
        subprocess.call (["/usr/sbin/xl", "unpause", vm.name])
        return

    if options.verbose:
        print "Running command on VM: '{0}'...".format(vm.name)

    if not vm.is_running():
        if not options.auto:
            print "VM '{0}' is not running. Please start it first or use the '--auto' switch".format(vm.name)
            exit (1)
    	try:
            if options.verbose:
                print "Starting the VM '{0}'...".format(vm.name)
            if options.tray:
                tray_notify ("Starting the '{0}' VM...".format(vm.name), label=vm.label)
            xid = vm.start(verbose=options.verbose)

        except (IOError, OSError, QubesException) as err:
            print "ERROR: {0}".format(err)
            if options.tray:
                tray_notify_error ("Error while starting the '{0}' VM: {1}".format(vm.name, err))
            exit (1)
        except (MemoryError) as err:
            print "ERROR: {0}".format(err)
            print "Close one or more running VMs and try again."
            if options.tray:
                subprocess.call(["kdialog", "--error", "Not enough memory to start '{0}' VM! Close one or more running VMs and try again.".format(vm.name)])
            exit (1)

        if os.getenv("DISPLAY") is not None:
            start_guid(vm, options)

        actually_execute(str(xid), cmd, options);

    else: # VM already running...
        xid = vm.get_xid()
        if os.getenv("DISPLAY") is not None and not os.path.isfile("/var/run/qubes/guid_running.{0}".format(xid)):
            start_guid(vm, options)
        actually_execute(str(xid), cmd, options);

def main():
    usage = "usage: %prog [options] [<vm-name>] [<cmd>]"
    parser = OptionParser (usage)
    parser.add_option ("-q", "--quiet", action="store_false", dest="verbose", default=True)
    parser.add_option ("-a", "--auto", action="store_true", dest="auto", default=False,
                       help="Auto start the VM if not running")
    parser.add_option ("-u", "--user", action="store", dest="user", default="user",
                       help="Run command in a VM as a specified user")
    parser.add_option ("--tray", action="store_true", dest="tray", default=False,
                       help="Use tray notifications instead of stdout" )
 
    parser.add_option ("--all", action="store_true", dest="run_on_all_running", default=False,
                      help="Run command on all currently running VMs (or all paused, in case of --unpause)")

    parser.add_option ("--exclude", action="append", dest="exclude_list",
                       help="When --all is used: exclude this VM name (might be repeated)")

    parser.add_option ("--wait", action="store_true", dest="wait_for_shutdown", default=False,
                      help="Wait for the VM(s) to shutdown")

    parser.add_option ("--shutdown", action="store_true", dest="shutdown", default=False,
                      help="Do 'xl shutdown' for the VM(s) (can be combined this with --all and --wait)")

    parser.add_option ("--pause", action="store_true", dest="pause", default=False,
                      help="Do 'xl pause' for the VM(s) (can be combined this with --all and --wait)")

    parser.add_option ("--unpause", action="store_true", dest="unpause", default=False,
                      help="Do 'xl unpause' for the VM(s) (can be combined this with --all and --wait)")

    parser.add_option ("-p", "--pass_io", action="store_true", dest="passio", default=False,
                      help="Pass stdin/stdout/stderr from remote program")

    parser.add_option ("--localcmd", action="store", dest="localcmd", default=None,
                      help="With --pass_io, pass stdin/stdout/stderr to the given program")

    parser.add_option ("--force", action="store_true", dest="force", default=False,
                      help="Force operation, even if may damage other VMs (eg shutdown of NetVM)")

    (options, args) = parser.parse_args ()


    if options.passio:
        options.verbose = False

    if (options.shutdown or options.pause or options.unpause):
        takes_cmd_argument = False
    else:
        takes_cmd_argument = True

    if options.run_on_all_running:
        if len(args) < 1 and takes_cmd_argument:
            parser.error ("You must provide a command to execute on all the VMs.")
        if len(args) > 1 or ((not takes_cmd_argument) and len(args) > 0):
            parser.error ("To many arguments...")
        cmdstr = args[0] if takes_cmd_argument else None
    else:
        if len (args) < 1 and not takes_cmd_argument:
            parser.error ("You must specify the VM name to shutdown/pause/unpause.")
        if len (args) < 2 and takes_cmd_argument:
            parser.error ("You must specify the VM name and the command to execute in the VM.")
        if len (args) > 2 or ((not takes_cmd_argument) and len(args) > 1):
            parser.error ("To many arguments...")
        vmname = args[0]
        cmdstr = args[1] if takes_cmd_argument else None

    if options.tray:
        global notify_object
        notify_object = dbus.SessionBus().get_object("org.freedesktop.Notifications", "/org/freedesktop/Notifications")

    qvm_collection = QubesVmCollection()
    qvm_collection.lock_db_for_reading()
    qvm_collection.load()
    qvm_collection.unlock_db()

    vms_list = []
    if options.run_on_all_running:
        all_vms = [vm for vm in qvm_collection.values()]
        for vm in all_vms:
            if options.exclude_list is not None and vm.name in options.exclude_list:
                continue
            if vm.qid == 0:
                continue
            if (options.unpause and vm.is_paused()) or (not options.unpause and  vm.is_running()):
                vms_list.append (vm)
    else:
        vm = qvm_collection.get_vm_by_name(vmname)
        if vm is None:
            print "A VM with the name '{0}' does not exist in the system!".format(vmname)
            exit(1)
        vms_list.append(vm)
    
        # If stopping NetVM - stop connected VMs too
        if options.shutdown and vm.is_netvm():
            connected_vms =  [vm for vm in qvm_collection.get_vms_connected_to(vm.qid) if vm.is_running()]
            if connected_vms and not options.force:
                print "ERROR: There are other VMs connected to this VM, "
                print "       shutdown them first or use --force option"
                print "VMs list: " + str([vm.name for vm in connected_vms])
                exit(1)

    if takes_cmd_argument:
        cmd = "{user}:{cmd}".format(user=options.user, cmd=cmdstr)
    else:
        cmd = None

    for vm in vms_list:
        vm_run_cmd(vm, cmd, options)


    if options.wait_for_shutdown:
        if options.verbose:
            print "Waiting for the VM(s) to shutdown..."
        shutdown_counter = 0

        while len (vms_list):
            if options.verbose:
                print "Waiting for VMs: ", [vm.name for vm in vms_list] 
            for vm in vms_list:
                if not vm.is_running():
                    vms_list.remove (vm)
                if shutdown_counter > shutdown_counter_max:
                    # kill the VM
                    if options.verbose:
                        print "Killing the (apparently hanging) VM '{0}'...".format(vm.name)
                    vm.force_shutdown()
                    #vms_list.remove(vm)

            shutdown_counter += 1
            time.sleep (1)
        exit (0) # there is no point in executing the other daemons in the case of --wait

    retcode = subprocess.call([qubes_clipd_path])
    if retcode != 0:
        print "ERROR: Cannot start qclipd!"
        if options.tray:
            tray_notify ("ERROR: Cannot start the Qubes Clipboard Notifier!")


main()