#!/usr/bin/python2
# -*- encoding: utf8 -*-
#
# 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 qubes.qubes import QubesVmCollection
from qubes.qubes import QubesVmLabels
from qubes.qubes import QubesHost
from qubes.qubes import system_path
from optparse import OptionParser
import subprocess
import os
import sys
import re
from qubes.qubes import vmm


def do_list(vm):
    label_width = 19
    fmt="{{0:<{0}}}: {{1}}".format(label_width)

    print fmt.format ("name", vm.name)
    print fmt.format ("label", vm.label.name)
    print fmt.format ("type", vm.type)
    if vm.template is not None:
        print fmt.format ("template", vm.template.name)
    if vm.netvm is not None:
        print fmt.format ("netvm", vm.netvm.name)
    if vm.qid != 0:
        print fmt.format("dispvm_netvm", "%s%s" % (
                         vm.dispvm_netvm.name if vm.dispvm_netvm
                         else "none",
                         " (default)" if vm.uses_default_dispvm_netvm else ""))
    print fmt.format ("updateable", vm.updateable)
    print fmt.format ("autostart", vm.autostart)
    print fmt.format ("installed_by_rpm", vm.installed_by_rpm)
    print fmt.format ("include_in_backups", vm.include_in_backups)
    print fmt.format ("last_backup", vm.backup_timestamp)
    print fmt.format ("dir", vm.dir_path)
    print fmt.format ("config", vm.conf_file)
    print fmt.format ("pcidevs", vm.pcidevs)
    print fmt.format ("pci_strictreset", vm.pci_strictreset)
    if vm.template is None:
        print fmt.format ("root_img", vm.root_img)
    if hasattr(vm, "rootcow_img") and vm.rootcow_img is not None:
        print fmt.format ("root_cow_img", vm.rootcow_img)
    if vm.template is not None:
        print fmt.format ("root_img", vm.template.root_img)
    if hasattr(vm, 'volatile_img') and vm.volatile_img is not None:
        print fmt.format ("root_volatile_img", vm.volatile_img)

    if hasattr(vm, 'private_img') and vm.private_img is not None:
        print fmt.format ("private_img", vm.private_img)
    print fmt.format ("vcpus", str(vm.vcpus))
    print fmt.format ("memory", vm.memory)
    if hasattr(vm, 'maxmem'):
        print fmt.format ("maxmem", vm.maxmem)
    print fmt.format ("MAC", "%s%s" % (vm.mac, " (auto)" if vm._mac is None else ""))

    if hasattr(vm, 'kernel'):
        if vm.uses_default_kernel:
            print fmt.format ("kernel", "%s (default)" % vm.kernel)
        else:
            print fmt.format ("kernel", vm.kernel)

    if hasattr(vm, 'kernelopts'):
        if vm.uses_default_kernelopts:
            print fmt.format ("kernelopts", "%s (default)" % vm.kernelopts)
        else:
            print fmt.format ("kernelopts", vm.kernelopts)
    if hasattr(vm, 'debug'):
        print fmt.format("debug", "on" if vm.debug else "off")

    if hasattr(vm, 'default_user'):
        print fmt.format("default_user", str(vm.default_user))

    if hasattr(vm, 'qrexec_installed'):
        print fmt.format("qrexec_installed", str(vm.qrexec_installed))

    if hasattr(vm, 'qrexec_timeout'):
        print fmt.format("qrexec_timeout", str(vm.qrexec_timeout))

    if hasattr(vm, 'guiagent_installed'):
        print fmt.format("guiagent_installed", str(vm.guiagent_installed))

    if hasattr(vm, 'seamless_gui_mode'):
        print fmt.format("seamless_gui_mode", str(vm.seamless_gui_mode))

    if hasattr(vm, 'drive'):
        print fmt.format("drive", str(vm.drive))

    if hasattr(vm, 'timezone'):
        print fmt.format("timezone", str(vm.timezone))

    print fmt.format ("internal", vm.internal)


def do_get(vms, vm, prop):

    if prop == 'config':
        prop = 'conf_file'
    elif prop == 'dir':
        prop = 'dir_path'
    elif prop == 'last_backup':
        prop = 'backup_timestamp'
    if not hasattr(vm, prop):
        print >>sys.stderr, "VM '{}' has no attribute '{}'".format(vm.name,
                                                                   prop)
        return
    if getattr(vm, prop, None) is None:
        # not set or set to None
        return
    if prop in ['template', 'netvm', 'dispvm_netvm', 'label']:
        print getattr(vm, prop).name
    else:
        print str(getattr(vm, prop))


def set_label(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing label name argument!"
        return False

    label = args[0]
    if label not in QubesVmLabels:
        print >> sys.stderr, "Wrong label name, supported values are the following:"
        for l in QubesVmLabels.values():
            print >> sys.stderr, "* {0}".format(l.name)
        return False

    vm.label = QubesVmLabels[label]
    return True

def set_memory(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing memory argument!"
        return False

    new_memory = int(args[0])

    if new_memory <= 0:
        print >>sys.stderr, "Memory size must be positive"
        return False

    qubes_host = QubesHost()
    if new_memory > qubes_host.memory_total/1024:
        print >> sys.stderr, "This host has only {0} MB of RAM".format(qubes_host.memory_total/1024)
        return False

    vm.memory = new_memory
    return True

def set_maxmem(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing maxmem argument!"
        exit (1)

    new_maxmem = int(args[0])

    if new_maxmem <= 0:
        print >>sys.stderr, "Memory size must be positive"
        return False

    qubes_host = QubesHost()
    if new_maxmem > qubes_host.memory_total/1024:
        print >> sys.stderr, "This host has only {0} MB of RAM".format(qubes_host.memory_total/1024)
        return False

    if new_maxmem < vm.memory:
        print >> sys.stderr, "WARNING: new maxmem smaller than memory property - VM will be able to use only 'maxmem' memory amount"

    vm.maxmem = new_maxmem
    return True

def set_mac(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing MAC argument!"
        return False

    if not re.match("[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}|auto", args[0]):
        print >> sys.stderr, "Invalid MAC argument!"
        print >> sys.stderr, "Possible values:"
        print >> sys.stderr, "1) auto"
        print >> sys.stderr, "2) MAC in format: XX:XX:XX:XX:XX:XX"
        return False

    mac = args[0]
    if mac == "auto":
        mac = None
    vm.mac = mac
    return True

def set_pcidevs(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing pcidevs argument!"
        return False

    if vm.is_running():
        print >>sys.stderr, "Cannot modify PCI devices of running VM, " \
            "use qvm-pci instead"
        return False
    vm.pcidevs = list(eval(args[0]))
    return True

def set_pci_strictreset(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False)!"
        return False

    vm.pci_strictreset = bool(eval(args[0].capitalize()))
    return True

def set_netvm(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing netvm name argument!"
        print >> sys.stderr, "Possible values:"
        print >> sys.stderr, "1) default"
        print >> sys.stderr, "2) none"
        print >> sys.stderr, "3) <vmaname>"
        return

    netvm = args[0]
    if netvm == "none":
        netvm = None
        vm.uses_default_netvm = False
    elif netvm == "default":
        netvm = vms.get_default_netvm()
        vm.uses_default_netvm = True
    else:
        netvm = vms.get_vm_by_name (netvm)
        if netvm is None:
            print >> sys.stderr, "A VM with the name '{0}' does not exist in the system.".format(netvm)
            return False
        if not netvm.is_netvm():
            print >> sys.stderr, "VM '{0}' is not a NetVM".format(netvm)
            return False
        vm.uses_default_netvm = False

    vm.netvm = netvm
    return True

def set_dispvm_netvm(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing netvm name argument!"
        print >> sys.stderr, "Possible values:"
        print >> sys.stderr, "1) default (the same as VM own netvm)"
        print >> sys.stderr, "2) none"
        print >> sys.stderr, "3) <vmaname>"
        return

    netvm = args[0]
    if netvm == "none":
        vm.dispvm_netvm = None
        vm.uses_default_dispvm_netvm = False
    elif netvm == "default":
        vm.uses_default_dispvm_netvm = True
    else:
        netvm = vms.get_vm_by_name (netvm)
        if netvm is None:
            print >> sys.stderr, "A VM with the name '{0}' does not exist in the system.".format(netvm)
            return False
        if not netvm.is_netvm():
            print >> sys.stderr, "VM '{0}' is not a NetVM".format(netvm)
            return False
        vm.dispvm_netvm = netvm
        vm.uses_default_dispvm_netvm = False
    return True

def set_kernel(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing kernel version argument!"
        print >> sys.stderr, "Possible values:"
        print >> sys.stderr, "1) default"
        print >> sys.stderr, "2) none (kernels subdir in VM)"
        print >> sys.stderr, "3) <kernel version>, one of:"
        for k in os.listdir(system_path["qubes_kernels_base_dir"]):
            print >> sys.stderr, "  -", k
        return False

    kernel = args[0]
    if kernel == "default":
        kernel = vms.get_default_kernel()
        vm.uses_default_kernel = True
    elif kernel == "none":
        kernel = None
        vm.uses_default_kernel = False
    else:
        if not os.path.exists(os.path.join(system_path["qubes_kernels_base_dir"], kernel)):
            print >> sys.stderr, "Kernel version {0} not installed.".format(kernel)
            return False
        vm.uses_default_kernel = False

    vm.kernel = kernel
    return True

def set_template(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing template name argument!"
        return False

    template_name = args[0];
    template = vms.get_vm_by_name(template_name)
    if template is None or template.qid not in vms:
        print >> sys.stderr, "A VM with the name '{0}' does not exist in the system.".format(template_name)
        return False

    if not template.is_template():
        print >> sys.stderr, "VM '{0}' is not a TemplateVM".format(template_name)
        return False

    print >> sys.stderr, "Setting template for VM '{0}' to '{1}'...".format (vm.name, template_name)
    vm.template = template
    return True

def set_vcpus(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing vcpus count argument!"
        return False

    vcpus = int(args[0])
    if vcpus <= 0:
        print >> sys.stderr, "A vcpus count must be positive."
        return False

    qubes_host = QubesHost()
    if vcpus > qubes_host.no_cpus:
        print >> sys.stderr, "This host has only {0} cpus".format(
            qubes_host.no_cpus)
        return False

    print >> sys.stderr, "Setting vcpus count for VM '{0}' to '{1}'...".format (vm.name, vcpus)
    vm.vcpus = vcpus
    return True

def set_kernelopts(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing kernel opts argument!"
        print >> sys.stderr, "Possible values:"
        print >> sys.stderr, "1) default"
        print >> sys.stderr, "2) <opts>"
        return False
    
    if args[0] == 'default':
        vm.uses_default_kernelopts = True
    else:
        vm.uses_default_kernelopts = False
        vm.kernelopts = args[0]

    return True

def set_name(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing new name!"
        return False

    if args[0] == vm.name:
        return False
    vm.set_name(args[0])
    return True

def set_drive(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing new drive content (file/device)!"
        return False

    if args[0] == '' or args[0].lower() == 'none':
        vm.drive = None
    else:
        vm.drive = args[0]
    return True

def set_debug(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False or on/off)!"
        return False

    if args[0].lower() == "on":
        vm.debug = True
    elif args[0].lower() == "off":
        vm.debug = False
    else:
        vm.debug = bool(eval(args[0].capitalize()))
    return True

def set_default_user(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing user name!"
        return False

    vm.default_user = args[0]
    return True

def set_include_in_backups(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False)!"
        return False

    vm.include_in_backups = bool(eval(args[0].capitalize()))
    return True

def set_qrexec_installed(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False)!"
        return False

    vm.qrexec_installed = bool(eval(args[0].capitalize()))
    return True

def set_internal(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False)!"
        return False

    vm.internal = bool(eval(args[0].capitalize()))
    return True

def set_guiagent_installed(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False)!"
        return False

    vm.guiagent_installed = bool(eval(args[0].capitalize()))
    return True

def set_seamless_gui_mode(vms, vm, args):
    if len(args) != 1:
        print >> sys.stderr, "Missing value (true/false)!"
        return False

    vm.seamless_gui_mode = bool(eval(args[0].capitalize()))
    return True

def set_autostart(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value (True/False)!"
        return False

    vm.autostart = bool(eval(args[0].capitalize()))
    return True

def set_qrexec_timeout(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing timeout value (seconds)!"
        return False

    if int(args[0]) < 0:
        print >> sys.stderr, "Negative timeout value not allowed!"
        return False

    vm.qrexec_timeout = int(args[0])
    return True

def set_timezone(vms, vm, args):
    if len (args) != 1:
        print >> sys.stderr, "Missing value ('localtime' or timeoffset in seconds)!"
        return False

    try:
        int(args[0])
    except ValueError:
        if args[0].lower() != 'localtime':
            print >> sys.stderr, "Invalid timezone value!"
            return False

    vm.timezone = args[0]
    return True

properties = {
    "include_in_backups": set_include_in_backups,
    "pcidevs": set_pcidevs,
    "pci_strictreset": set_pci_strictreset,
    "label" : set_label,
    "netvm" : set_netvm,
    "dispvm_netvm" : set_dispvm_netvm,
    "maxmem" : set_maxmem,
    "memory" : set_memory,
    "kernel" : set_kernel,
    "template" : set_template,
    "vcpus" : set_vcpus,
    "kernelopts": set_kernelopts,
    "name": set_name,
    "drive": set_drive,
    "mac": set_mac,
    "debug": set_debug,
    "default_user": set_default_user,
    "qrexec_installed": set_qrexec_installed,
    "guiagent_installed": set_guiagent_installed,
    "seamless_gui_mode": set_seamless_gui_mode,
    "qrexec_timeout": set_qrexec_timeout,
    "timezone": set_timezone,
    "internal": set_internal,
    "autostart": set_autostart,
}


def do_set(vms, vm, property, args):
    if property not in properties.keys():
        print >> sys.stderr, "ERROR: Wrong property name: '{0}'".format(property)
        return False

    if not hasattr(vm, property):
        print >> sys.stderr, "ERROR: Property '{0}' not available for this VM".format(property)
        return False

    try:
        return properties[property](vms, vm, args)
    except Exception as err:
        print >> sys.stderr, "ERROR: %s" % str(err)
        return False


def main():
    usage = "usage: %prog -l [options] <vm-name>\n"\
            "usage: %prog -g [options] <vm-name> <property>\n"\
            "usage: %prog -s [options] <vm-name> <property> [...]\n"\
            "List/set various per-VM properties."

    parser = OptionParser (usage)
    parser.add_option("-l", "--list", action="store_true", dest="do_list",
                      default=False)
    parser.add_option("-s", "--set", action="store_true", dest="do_set",
                      default=False)
    parser.add_option ("-g", "--gry", action="store_true", dest="do_get",
                       default=False)
    parser.add_option("--force-root", action="store_true", dest="force_root",
                      default=False,
                      help="Force to run, even with root privileges")
    parser.add_option ("--offline-mode", dest="offline_mode",
                       action="store_true", default=False,
                       help="Offline mode")

    (options, args) = parser.parse_args ()
    if (len (args) < 1):
        parser.error ("You must provide at least the vmname!")

    vmname = args[0]

    if hasattr(os, "geteuid") and os.geteuid() == 0:
        if not options.force_root:
            print >> sys.stderr, "*** Running this tool as root is strongly discouraged, this will lead you in permissions problems."
            print >> sys.stderr, "Retry as unprivileged user."
            print >> sys.stderr, "... or use --force-root to continue anyway."
            exit(1)

    if options.do_list + options.do_set + options.do_get > 1:
        print >> sys.stderr, "You can provide at most one of -l, -g and -s at " \
                             "the same time!"
        exit(1)

    if options.offline_mode:
        vmm.offline_mode = True

    if options.do_set:
        qvm_collection = QubesVmCollection()
        qvm_collection.lock_db_for_writing()
        qvm_collection.load()
    else:
        qvm_collection = QubesVmCollection()
        qvm_collection.lock_db_for_reading()
        qvm_collection.load()
        qvm_collection.unlock_db()

    vm = qvm_collection.get_vm_by_name(vmname)
    if vm is None or vm.qid not in qvm_collection:
        print >> sys.stderr, "A VM with the name '{0}' does not exist in the system.".format(vmname)
        exit(1)

    if options.do_set:
        if len (args) < 2:
            print >> sys.stderr, "You must specify the property you wish to set..."
            print >> sys.stderr, "Available properties:"
            for p in properties.keys():
                if hasattr(vm, p):
                    print >> sys.stderr, "--> '{0}'".format(p)
            exit (1)

        property = args[1]
        if do_set(qvm_collection, vm, property, args[2:]):
            qvm_collection.save()
            qvm_collection.unlock_db()
        else:
            qvm_collection.unlock_db()
            exit(1)

    elif options.do_get or len(args) == 2:
        do_get(qvm_collection, vm, args[1])
    else:
        # do_list
        do_list(vm)

main()