#!/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.
#
#
import sys
import os
import os.path
import subprocess
import xml.etree.ElementTree
import xml.parsers.expat
import fcntl
import re
import shutil
import uuid
import time
from datetime import datetime
from qmemman_client import QMemmanClient
# Do not use XenAPI or create/read any VM files
# This is for testing only!
dry_run = False
#dry_run = True
if not dry_run:
import xen.lowlevel.xc
import xen.lowlevel.xl
import xen.lowlevel.xs
qubes_guid_path = "/usr/bin/qubes_guid"
qrexec_daemon_path = "/usr/lib/qubes/qrexec_daemon"
qrexec_client_path = "/usr/lib/qubes/qrexec_client"
qubes_base_dir = "/var/lib/qubes"
qubes_appvms_dir = qubes_base_dir + "/appvms"
qubes_templates_dir = qubes_base_dir + "/vm-templates"
qubes_servicevms_dir = qubes_base_dir + "/servicevms"
qubes_store_filename = qubes_base_dir + "/qubes.xml"
qubes_kernels_base_dir = qubes_base_dir + "/vm-kernels"
qubes_max_xid = 1024
qubes_max_qid = 254
qubes_max_netid = 254
vm_default_netmask = "255.255.255.0"
default_root_img = "root.img"
default_rootcow_img = "root-cow.img"
default_volatile_img = "volatile.img"
default_clean_volatile_img = "clean-volatile.img.tar"
default_private_img = "private.img"
default_appmenus_templates_subdir = "apps.templates"
default_appmenus_template_templates_subdir = "apps-template.templates"
default_kernels_subdir = "kernels"
default_firewall_conf_file = "firewall.xml"
default_memory = 400
default_servicevm_vcpus = 1
default_kernelopts = ""
default_kernelopts_pcidevs = "iommu=soft swiotlb=2048"
qubes_whitelisted_appmenus = 'whitelisted-appmenus.list'
dom0_update_check_interval = 6*3600
# do not allow to start a new AppVM if Dom0 mem was to be less than this
dom0_min_memory = 700*1024*1024
# We need this global reference, as each instance of QubesVm
# must be able to ask Dom0 VM about how much memory it currently has...
dom0_vm = None
qubes_appmenu_create_cmd = "/usr/lib/qubes/create_apps_for_appvm.sh"
qubes_appmenu_remove_cmd = "/usr/lib/qubes/remove_appvm_appmenus.sh"
qubes_pciback_cmd = '/usr/lib/qubes/unbind_pci_device.sh'
class QubesException (Exception) : pass
if not dry_run:
xc = xen.lowlevel.xc.xc()
xs = xen.lowlevel.xs.xs()
xl_ctx = xen.lowlevel.xl.ctx()
class QubesHost(object):
def __init__(self):
self.physinfo = xc.physinfo()
self.xen_total_mem = long(self.physinfo['total_memory'])
self.xen_no_cpus = self.physinfo['nr_cpus']
# print "QubesHost: total_mem = {0}B".format (self.xen_total_mem)
# print "QubesHost: free_mem = {0}".format (self.get_free_xen_memory())
# print "QubesHost: total_cpus = {0}".format (self.xen_no_cpus)
@property
def memory_total(self):
return self.xen_total_mem
@property
def no_cpus(self):
return self.xen_no_cpus
def get_free_xen_memory(self):
ret = self.physinfo['free_memory']
return long(ret)
# measure cpu usage for all domains at once
def measure_cpu_usage(self, previous=None, previous_time = None, wait_time=1):
if previous is None:
previous_time = time.time()
previous = {}
info = xc.domain_getinfo(0, qubes_max_xid)
for vm in info:
previous[vm['domid']] = {}
previous[vm['domid']]['cpu_time'] = vm['cpu_time']/vm['online_vcpus']
previous[vm['domid']]['cpu_usage'] = 0
time.sleep(wait_time)
current_time = time.time()
current = {}
info = xc.domain_getinfo(0, qubes_max_xid)
for vm in info:
current[vm['domid']] = {}
current[vm['domid']]['cpu_time'] = vm['cpu_time']/max(vm['online_vcpus'],1)
if vm['domid'] in previous.keys():
current[vm['domid']]['cpu_usage'] = \
float(current[vm['domid']]['cpu_time'] - previous[vm['domid']]['cpu_time']) \
/ long(1000**3) / (current_time-previous_time) * 100
if current[vm['domid']]['cpu_usage'] < 0:
# VM has been rebooted
current[vm['domid']]['cpu_usage'] = 0
else:
current[vm['domid']]['cpu_usage'] = 0
return (current_time, current)
class QubesVmLabel(object):
def __init__(self, name, index, color = None, icon = None):
self.name = name
self.index = index
self.color = color if color is not None else name
self.icon = icon if icon is not None else name
self.icon_path = "/usr/share/qubes/icons/" + self.icon + ".png"
# Globally defined lables
QubesVmLabels = {
"red" : QubesVmLabel ("red", 1),
"orange" : QubesVmLabel ("orange", 2),
"yellow" : QubesVmLabel ("yellow", 3),
"green" : QubesVmLabel ("green", 4, color="0x5fa05e"),
"gray" : QubesVmLabel ("gray", 5),
"blue" : QubesVmLabel ("blue", 6),
"purple" : QubesVmLabel ("purple", 7, color="0xb83374"),
"black" : QubesVmLabel ("black", 8),
}
default_appvm_label = QubesVmLabels["red"]
default_template_label = QubesVmLabels["gray"]
default_servicevm_label = QubesVmLabels["red"]
class QubesVm(object):
"""
A representation of one Qubes VM
Only persistent information are stored here, while all the runtime
information, e.g. Xen dom id, etc, are to be retrieved via Xen API
Note that qid is not the same as Xen's domid!
"""
def __init__(self, qid, name,
dir_path, conf_file = None,
uses_default_netvm = True,
netvm_vm = None,
installed_by_rpm = False,
updateable = False,
label = None,
root_img = None,
private_img = None,
memory = default_memory,
maxmem = None,
template_vm = None,
firewall_conf = None,
volatile_img = None,
pcidevs = None,
internal = False,
vcpus = None,
kernel = None,
uses_default_kernel = True,
kernelopts = "",
uses_default_kernelopts = True,
services = None):
assert qid < qubes_max_qid, "VM id out of bounds!"
self.__qid = qid
self.name = name
dir_path = dir_path
self.dir_path = dir_path
conf_file = conf_file
if self.dir_path is not None:
if (conf_file is None):
self.conf_file = dir_path + "/" + name + ".conf"
else:
if os.path.isabs(conf_file):
self.conf_file = conf_file
else:
self.conf_file = dir_path + "/" + conf_file
self.uses_default_netvm = uses_default_netvm
self.netvm_vm = netvm_vm
if netvm_vm is not None:
netvm_vm.connected_vms[qid] = self
# We use it in remove from disk to avoid removing rpm files (for templates)
self.installed_by_rpm = installed_by_rpm
# Setup standard VM storage; some VM types may not use them all
if root_img is not None and os.path.isabs(root_img):
self.root_img = root_img
else:
self.root_img = dir_path + "/" + (
root_img if root_img is not None else default_root_img)
self.volatile_img = dir_path + "/" + default_volatile_img
if private_img is not None and os.path.isabs(private_img):
self.private_img = private_img
else:
self.private_img = dir_path + "/" + (
private_img if private_img is not None else default_private_img)
if firewall_conf is None:
self.firewall_conf = dir_path + "/" + default_firewall_conf_file
else:
self.firewall_conf = firewall_conf
self.updateable = updateable
self.label = label if label is not None else QubesVmLabels["red"]
if self.dir_path is not None:
self.icon_path = self.dir_path + "/icon.png"
else:
self.icon_path = None
# PCI devices - used only by NetVM
if pcidevs is None or pcidevs == "none":
self.pcidevs = []
elif pcidevs.find('[') < 0:
# Backward compatibility
self.pcidevs = eval('[' + pcidevs + ']')
else:
self.pcidevs = eval(pcidevs)
self.memory = memory
if maxmem is None:
host = QubesHost()
total_mem_mb = host.memory_total/1024
self.maxmem = total_mem_mb/2
else:
self.maxmem = maxmem
self.template_vm = template_vm
if template_vm is not None:
if updateable:
print >> sys.stderr, "ERROR: Template based VM cannot be updateable!"
return False
if not template_vm.is_template():
print >> sys.stderr, "ERROR: template_qid={0} doesn't point to a valid TemplateVM".\
format(template_vm.qid)
return False
template_vm.appvms[qid] = self
else:
assert self.root_img is not None, "Missing root_img for standalone VM!"
self.kernel = kernel
if template_vm is not None:
self.kernels_dir = template_vm.kernels_dir
self.kernel = template_vm.kernel
elif self.kernel is not None:
self.kernels_dir = qubes_kernels_base_dir + "/" + self.kernel
else:
# for backward compatibility (or another rare case): kernel=None -> kernel in VM dir
self.kernels_dir = self.dir_path + "/" + default_kernels_subdir
self.uses_default_kernel = uses_default_kernel
self.appmenus_templates_dir = None
if updateable:
self.appmenus_templates_dir = self.dir_path + "/" + default_appmenus_templates_subdir
elif template_vm is not None:
self.appmenus_templates_dir = template_vm.appmenus_templates_dir
# By default allow use all VCPUs
if vcpus is None:
qubes_host = QubesHost()
self.vcpus = qubes_host.no_cpus
else:
self.vcpus = vcpus
self.uses_default_kernelopts = uses_default_kernelopts
if self.uses_default_kernelopts:
if len(self.pcidevs) > 0:
self.kernelopts = default_kernelopts_pcidevs
else:
self.kernelopts = default_kernelopts
else:
self.kernelopts = kernelopts
self.services = {}
if services is not None:
self.services = eval(str(services))
# Internal VM (not shown in qubes-manager, doesn't create appmenus entries
self.internal = internal
self.xid = -1
self.xid = self.get_xid()
@property
def qid(self):
return self.__qid
@property
def ip(self):
if self.netvm_vm is not None:
return self.netvm_vm.get_ip_for_vm(self.qid)
else:
return None
@property
def netmask(self):
if self.netvm_vm is not None:
return self.netvm_vm.netmask
else:
return None
@property
def gateway(self):
if self.netvm_vm is not None:
return self.netvm_vm.gateway
else:
return None
@property
def secondary_dns(self):
if self.netvm_vm is not None:
return self.netvm_vm.secondary_dns
else:
return None
def is_updateable(self):
return self.updateable
def is_networked(self):
if self.is_netvm():
return True
if self.netvm_vm is not None:
return True
else:
return False
def set_updateable(self):
if self.is_updateable():
return
raise QubesException ("Change 'updateable' flag is not supported. Please use qvm-create.")
def set_nonupdateable(self):
if not self.is_updateable():
return
raise QubesException ("Change 'updateable' flag is not supported. Please use qvm-create.")
def is_template(self):
return isinstance(self, QubesTemplateVm)
def is_appvm(self):
return isinstance(self, QubesAppVm)
def is_netvm(self):
return isinstance(self, QubesNetVm)
def is_proxyvm(self):
return isinstance(self, QubesProxyVm)
def is_disposablevm(self):
return isinstance(self, QubesDisposableVm)
def get_xl_dominfo(self):
if dry_run:
return
domains = xl_ctx.list_domains()
for dominfo in domains:
domname = xl_ctx.domid_to_name(dominfo.domid)
if domname == self.name:
return dominfo
return None
def get_xc_dominfo(self):
if dry_run:
return
start_xid = self.xid
if start_xid < 0:
start_xid = 0
try:
domains = xc.domain_getinfo(start_xid, qubes_max_xid-start_xid)
except xen.lowlevel.xc.Error:
return None
for dominfo in domains:
domname = xl_ctx.domid_to_name(dominfo['domid'])
if domname == self.name:
return dominfo
return None
def get_xid(self):
if dry_run:
return 666
dominfo = self.get_xc_dominfo()
if dominfo:
self.xid = dominfo['domid']
return self.xid
else:
return -1
def get_uuid(self):
dominfo = self.get_xl_dominfo()
if dominfo:
vmuuid = uuid.UUID(''.join('%02x' % b for b in dominfo.uuid))
return vmuuid
else:
return None
def get_mem(self):
if dry_run:
return 666
dominfo = self.get_xc_dominfo()
if dominfo:
return dominfo['mem_kb']
else:
return 0
def get_mem_static_max(self):
if dry_run:
return 666
dominfo = self.get_xc_dominfo()
if dominfo:
return dominfo['maxmem_kb']
else:
return 0
def get_per_cpu_time(self):
if dry_run:
import random
return random.random() * 100
dominfo = self.get_xc_dominfo()
if dominfo:
return dominfo['cpu_time']/dominfo['online_vcpus']
else:
return 0
def get_disk_utilization_root_img(self):
if not os.path.exists(self.root_img):
return 0
return self.get_disk_usage(self.root_img)
def get_root_img_sz(self):
if not os.path.exists(self.root_img):
return 0
return os.path.getsize(self.root_img)
def get_power_state(self):
if dry_run:
return "NA"
dominfo = self.get_xc_dominfo()
if dominfo:
if dominfo['paused']:
return "Paused"
elif dominfo['crashed']:
return "Crashed"
elif dominfo['shutdown']:
return "Halting"
elif dominfo['dying']:
return "Dying"
else:
return "Running"
else:
return 'Halted'
return "NA"
def is_running(self):
if self.get_power_state() == "Running":
return True
else:
return False
def is_paused(self):
if self.get_power_state() == "Paused":
return True
else:
return False
def get_start_time(self):
if not self.is_running():
return None
dominfo = self.get_xl_dominfo()
uuid = self.get_uuid()
start_time = xs.read('', "/vm/%s/start_time" % str(uuid))
if start_time != '':
return datetime.datetime.fromtimestamp(float(start_time))
else:
return None
def is_outdated(self):
# Makes sense only on VM based on template
if self.template_vm is None:
return False
if not self.is_running():
return False
rootimg_inode = os.stat(self.template_vm.root_img)
rootcow_inode = os.stat(self.template_vm.rootcow_img)
current_dmdev = "/dev/mapper/snapshot-{0:x}:{1}-{2:x}:{3}".format(
rootimg_inode[2], rootimg_inode[1],
rootcow_inode[2], rootcow_inode[1])
# Don't know why, but 51712 is xvda
# backend node name not available through xenapi :(
used_dmdev = xs.read('', "/local/domain/0/backend/vbd/{0}/51712/node".format(self.get_xid()))
return used_dmdev != current_dmdev
def get_disk_usage(self, file_or_dir):
if not os.path.exists(file_or_dir):
return 0
p = subprocess.Popen (["du", "-s", "--block-size=1", file_or_dir],
stdout=subprocess.PIPE)
result = p.communicate()
m = re.match(r"^(\d+)\s.*", result[0])
sz = int(m.group(1)) if m is not None else 0
return sz
def get_disk_utilization(self):
return self.get_disk_usage(self.dir_path)
def get_disk_utilization_private_img(self):
return self.get_disk_usage(self.private_img)
def get_private_img_sz(self):
if not os.path.exists(self.private_img):
return 0
return os.path.getsize(self.private_img)
def resize_private_img(self, size):
f_private = open (self.private_img, "a+b")
f_private.truncate (size)
f_private.close ()
def cleanup_vifs(self):
"""
Xend does not remove vif when backend domain is down, so we must do it
manually
"""
if not self.is_running():
return
dev_basepath = '/local/domain/%d/device/vif' % self.xid
for dev in xs.ls('', dev_basepath):
# check if backend domain is alive
backend_xid = int(xs.read('', '%s/%s/backend-id' % (dev_basepath, dev)))
if xl_ctx.domid_to_name(backend_xid) is not None:
# check if device is still active
if xs.read('', '%s/%s/state' % (dev_basepath, dev)) == '4':
continue
# remove dead device
xs.rm('', '%s/%s' % (dev_basepath, dev))
def create_xenstore_entries(self, xid = None):
if dry_run:
return
if xid is None:
xid = self.xid
domain_path = xs.get_domain_path(xid)
# Set Xen Store entires with VM networking info:
xs.write('', "{0}/qubes_vm_type".format(domain_path),
self.type)
xs.write('', "{0}/qubes_vm_updateable".format(domain_path),
str(self.updateable))
if self.is_netvm():
xs.write('',
"{0}/qubes_netvm_gateway".format(domain_path),
self.gateway)
xs.write('',
"{0}/qubes_netvm_secondary_dns".format(domain_path),
self.secondary_dns)
xs.write('',
"{0}/qubes_netvm_netmask".format(domain_path),
self.netmask)
xs.write('',
"{0}/qubes_netvm_network".format(domain_path),
self.network)
if self.netvm_vm is not None:
xs.write('', "{0}/qubes_ip".format(domain_path), self.ip)
xs.write('', "{0}/qubes_netmask".format(domain_path),
self.netvm_vm.netmask)
xs.write('', "{0}/qubes_gateway".format(domain_path),
self.netvm_vm.gateway)
xs.write('',
"{0}/qubes_secondary_dns".format(domain_path),
self.netvm_vm.secondary_dns)
for srv in self.services.keys():
# convert True/False to "1"/"0"
xs.write('', "{0}/qubes-service/{1}".format(domain_path, srv),
str(int(self.services[srv])))
xs.write('',
"{0}/qubes-block-devices".format(domain_path),
'')
# Fix permissions
xs.set_permissions('', '{0}/device'.format(domain_path),
[{ 'dom': xid }])
xs.set_permissions('', '{0}/memory'.format(domain_path),
[{ 'dom': xid }])
xs.set_permissions('', '{0}/qubes-block-devices'.format(domain_path),
[{ 'dom': xid }])
def get_rootdev(self, source_template=None):
if self.template_vm:
return "'script:snapshot:{dir}/root.img:{dir}/root-cow.img,xvda,r',".format(dir=self.template_vm.dir_path)
else:
return "'script:file:{dir}/root.img,xvda,w',".format(dir=self.dir_path)
def get_config_params(self, source_template=None):
args = {}
args['name'] = self.name
args['kerneldir'] = self.kernels_dir
args['vmdir'] = self.dir_path
args['pcidev'] = str(self.pcidevs).strip('[]')
args['mem'] = str(self.memory)
args['maxmem'] = str(self.maxmem)
args['vcpus'] = str(self.vcpus)
if self.netvm_vm is not None:
args['netdev'] = "'script=/etc/xen/scripts/vif-route-qubes,ip={ip}".format(ip=self.ip)
if self.netvm_vm.qid != 0:
args['netdev'] += ",backend={0}".format(self.netvm_vm.name)
args['netdev'] += "'"
else:
args['netdev'] = ''
args['rootdev'] = self.get_rootdev(source_template=source_template)
args['privatedev'] = "'script:file:{dir}/private.img,xvdb,w',".format(dir=self.dir_path)
args['volatiledev'] = "'script:file:{dir}/volatile.img,xvdc,w',".format(dir=self.dir_path)
modulesmode='r'
if self.is_updateable() and self.kernel is None:
modulesmode='w'
args['otherdevs'] = "'script:file:{dir}/modules.img,xvdd,{mode}',".format(dir=self.kernels_dir, mode=modulesmode)
args['kernelopts'] = self.kernelopts
return args
def create_config_file(self, file_path = None, source_template = None, prepare_dvm = False):
if file_path is None:
file_path = self.conf_file
if source_template is None:
source_template = self.template_vm
f_conf_template = open('/usr/share/qubes/vm-template.conf', 'r')
conf_template = f_conf_template.read()
f_conf_template.close()
template_params = self.get_config_params(source_template)
if prepare_dvm:
template_params['name'] = '%NAME%'
template_params['privatedev'] = ''
template_params['netdev'] = re.sub(r"ip=[0-9.]*", "ip=%IP%", template_params['netdev'])
conf_appvm = open(file_path, "w")
conf_appvm.write(conf_template.format(**template_params))
conf_appvm.close()
def create_on_disk(self, verbose, source_template = None):
if source_template is None:
source_template = self.template_vm
assert source_template is not None
if dry_run:
return
if verbose:
print >> sys.stderr, "--> Creating directory: {0}".format(self.dir_path)
os.mkdir (self.dir_path)
if verbose:
print >> sys.stderr, "--> Creating the VM config file: {0}".format(self.conf_file)
self.create_config_file(source_template = source_template)
template_priv = source_template.private_img
if verbose:
print >> sys.stderr, "--> Copying the template's private image: {0}".\
format(template_priv)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", template_priv, self.private_img])
if retcode != 0:
raise IOError ("Error while copying {0} to {1}".\
format(template_priv, self.private_img))
if os.path.exists(source_template.dir_path + '/vm-' + qubes_whitelisted_appmenus):
if verbose:
print >> sys.stderr, "--> Creating default whitelisted apps list: {0}".\
format(self.dir_path + '/' + qubes_whitelisted_appmenus)
shutil.copy(source_template.dir_path + '/vm-' + qubes_whitelisted_appmenus,
self.dir_path + '/' + qubes_whitelisted_appmenus)
if self.is_updateable():
template_root = source_template.root_img
if verbose:
print >> sys.stderr, "--> Copying the template's root image: {0}".\
format(template_root)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", template_root, self.root_img])
if retcode != 0:
raise IOError ("Error while copying {0} to {1}".\
format(template_root, self.root_img))
kernels_dir = source_template.kernels_dir
if verbose:
print >> sys.stderr, "--> Copying the kernel (set kernel \"none\" to use it): {0}".\
format(kernels_dir)
os.mkdir (self.dir_path + '/kernels')
for f in ("vmlinuz", "initramfs", "modules.img"):
shutil.copy(kernels_dir + '/' + f, self.dir_path + '/kernels/' + f)
# Create volatile.img
self.reset_volatile_storage(source_template = source_template, verbose=verbose)
def create_appmenus(self, verbose, source_template = None):
if source_template is None:
source_template = self.template_vm
vmtype = None
if self.is_netvm():
vmtype = 'servicevms'
else:
vmtype = 'appvms'
try:
if source_template is not None:
subprocess.check_call ([qubes_appmenu_create_cmd, source_template.appmenus_templates_dir, self.name])
elif self.appmenus_templates_dir is not None:
subprocess.check_call ([qubes_appmenu_create_cmd, self.appmenus_templates_dir, self.name])
else:
# Only add apps to menu
subprocess.check_call ([qubes_appmenu_create_cmd, "none", self.name, vmtype])
except subprocess.CalledProcessError:
print >> sys.stderr, "Ooops, there was a problem creating appmenus for {0} VM!".format (self.name)
def verify_files(self):
if dry_run:
return
if not os.path.exists (self.dir_path):
raise QubesException (
"VM directory doesn't exist: {0}".\
format(self.dir_path))
if self.is_updateable() and not os.path.exists (self.root_img):
raise QubesException (
"VM root image file doesn't exist: {0}".\
format(self.root_img))
if not os.path.exists (self.private_img):
raise QubesException (
"VM private image file doesn't exist: {0}".\
format(self.private_img))
if not os.path.exists (self.kernels_dir + '/vmlinuz'):
raise QubesException (
"VM kernel does not exists: {0}".\
format(self.kernels_dir + '/vmlinuz'))
if not os.path.exists (self.kernels_dir + '/initramfs'):
raise QubesException (
"VM initramfs does not exists: {0}".\
format(self.kernels_dir + '/initramfs'))
if not os.path.exists (self.kernels_dir + '/modules.img'):
raise QubesException (
"VM kernel modules image does not exists: {0}".\
format(self.kernels_dir + '/modules.img'))
return True
def reset_volatile_storage(self, source_template = None, verbose = False):
assert not self.is_running(), "Attempt to clean volatile image of running VM!"
if source_template is None:
source_template = self.template_vm
# Only makes sense on template based VM
if source_template is None:
return
if verbose:
print >> sys.stderr, "--> Cleaning volatile image: {0}...".format (self.volatile_img)
if dry_run:
return
if os.path.exists (self.volatile_img):
os.remove (self.volatile_img)
retcode = subprocess.call (["tar", "xf", source_template.clean_volatile_img, "-C", self.dir_path])
if retcode != 0:
raise IOError ("Error while unpacking {0} to {1}".\
format(source_template.clean_volatile_img, self.volatile_img))
def remove_from_disk(self):
if dry_run:
return
shutil.rmtree (self.dir_path)
def write_firewall_conf(self, conf):
root = xml.etree.ElementTree.Element(
"QubesFirwallRules",
policy = "allow" if conf["allow"] else "deny",
dns = "allow" if conf["allowDns"] else "deny",
icmp = "allow" if conf["allowIcmp"] else "deny"
)
for rule in conf["rules"]:
element = xml.etree.ElementTree.Element(
"rule",
address=rule["address"],
port=str(rule["portBegin"]),
)
if rule["netmask"] is not None and rule["netmask"] != 32:
element.set("netmask", str(rule["netmask"]))
if rule["portEnd"] is not None:
element.set("toport", str(rule["portEnd"]))
root.append(element)
tree = xml.etree.ElementTree.ElementTree(root)
try:
f = open(self.firewall_conf, 'a') # create the file if not exist
f.close()
with open(self.firewall_conf, 'w') as f:
fcntl.lockf(f, fcntl.LOCK_EX)
tree.write(f, "UTF-8")
fcntl.lockf(f, fcntl.LOCK_UN)
f.close()
except EnvironmentError as err:
print >> sys.stderr, "{0}: save error: {1}".format(
os.path.basename(sys.argv[0]), err)
return False
return True
def has_firewall(self):
return os.path.exists (self.firewall_conf)
def get_firewall_conf(self):
conf = { "rules": list(), "allow": True, "allowDns": True, "allowIcmp": True }
try:
tree = xml.etree.ElementTree.parse(self.firewall_conf)
root = tree.getroot()
conf["allow"] = (root.get("policy") == "allow")
conf["allowDns"] = (root.get("dns") == "allow")
conf["allowIcmp"] = (root.get("icmp") == "allow")
for element in root:
rule = {}
attr_list = ("address", "netmask", "port", "toport")
for attribute in attr_list:
rule[attribute] = element.get(attribute)
if rule["netmask"] is not None:
rule["netmask"] = int(rule["netmask"])
else:
rule["netmask"] = 32
rule["portBegin"] = int(rule["port"])
if rule["toport"] is not None:
rule["portEnd"] = int(rule["toport"])
else:
rule["portEnd"] = None
del(rule["port"])
del(rule["toport"])
conf["rules"].append(rule)
except EnvironmentError as err:
return conf
except (xml.parsers.expat.ExpatError,
ValueError, LookupError) as err:
print("{0}: load error: {1}".format(
os.path.basename(sys.argv[0]), err))
return None
return conf
def attach_network(self, verbose = False, wait = True, netvm = None):
if dry_run:
return
if not self.is_running():
raise QubesException ("VM not running!")
if netvm is None:
netvm = self.netvm_vm
if netvm is None:
raise QubesException ("NetVM not set!")
if netvm.qid != 0:
if not netvm.is_running():
if verbose:
print >> sys.stderr, "--> Starting NetVM {0}...".format(netvm.name)
netvm.start()
xs_path = '/local/domain/%d/device/vif/0/state' % (self.xid)
if xs.read('', xs_path) is not None:
# TODO: check its state and backend state (this can be stale vif after NetVM restart)
if verbose:
print >> sys.stderr, "NOTICE: Network already attached"
return
xm_cmdline = ["/usr/sbin/xl", "network-attach", str(self.xid), "script=/etc/xen/scripts/vif-route-qubes", "ip="+self.ip, "backend="+netvm.name ]
retcode = subprocess.call (xm_cmdline)
if retcode != 0:
print >> sys.stderr, ("WARNING: Cannot attach to network to '{0}'!".format(self.name))
if wait:
tries = 0
while xs.read('', xs_path) != '4':
tries += 1
if tries > 50:
raise QubesException ("Network attach timed out!")
time.sleep(0.2)
def start(self, debug_console = False, verbose = False, preparing_dvm = False):
if dry_run:
return
# Intentionally not used is_running(): eliminate also "Paused", "Crashed", "Halting"
if self.get_power_state() != "Halted":
raise QubesException ("VM is already running!")
if self.netvm_vm is not None:
if self.netvm_vm.qid != 0:
if not self.netvm_vm.is_running():
if verbose:
print >> sys.stderr, "--> Starting NetVM {0}...".format(self.netvm_vm.name)
self.netvm_vm.start()
self.reset_volatile_storage(verbose=verbose)
if verbose:
print >> sys.stderr, "--> Loading the VM (type = {0})...".format(self.type)
# refresh config file
self.create_config_file()
mem_required = int(self.memory) * 1024 * 1024
qmemman_client = QMemmanClient()
if not qmemman_client.request_memory(mem_required):
qmemman_client.close()
raise MemoryError ("ERROR: insufficient memory to start this VM")
# Bind pci devices to pciback driver
for pci in self.pcidevs:
subprocess.check_call(['sudo', qubes_pciback_cmd, pci])
xl_cmdline = ['sudo', '/usr/sbin/xl', 'create', self.conf_file, '-q', '-p']
try:
subprocess.check_call(xl_cmdline)
except:
raise QubesException("Failed to load VM config")
xid = self.get_xid()
self.xid = xid
if verbose:
print >> sys.stderr, "--> Setting Xen Store info for the VM..."
self.create_xenstore_entries(xid)
qvm_collection = QubesVmCollection()
qvm_collection.lock_db_for_reading()
qvm_collection.load()
qvm_collection.unlock_db()
if verbose:
print >> sys.stderr, "--> Updating firewall rules..."
for vm in qvm_collection.values():
if vm.is_proxyvm() and vm.is_running():
vm.write_iptables_xenstore_entry()
if verbose:
print >> sys.stderr, "--> Starting the VM..."
xc.domain_unpause(xid)
# close() is not really needed, because the descriptor is close-on-exec
# anyway, the reason to postpone close() is that possibly xl is not done
# constructing the domain after its main process exits
# so we close() when we know the domain is up
# the successful unpause is some indicator of it
qmemman_client.close()
if not preparing_dvm:
if verbose:
print >> sys.stderr, "--> Starting the qrexec daemon..."
retcode = subprocess.call ([qrexec_daemon_path, str(xid)])
if (retcode != 0) :
self.force_shutdown()
raise OSError ("ERROR: Cannot execute qrexec_daemon!")
if preparing_dvm:
if verbose:
print >> sys.stderr, "--> Preparing config template for DispVM"
self.create_config_file(file_path = self.dir_path + '/dvm.conf', prepare_dvm = True)
# perhaps we should move it before unpause and fork?
# FIXME: this uses obsolete xm api
if debug_console:
from xen.xm import console
if verbose:
print >> sys.stderr, "--> Starting debug console..."
console.execConsole (xid)
return xid
def shutdown(self, force=False):
if dry_run:
return
subprocess.call (['/usr/sbin/xl', 'shutdown', self.name])
#xc.domain_destroy(self.get_xid())
def force_shutdown(self):
if dry_run:
return
subprocess.call (['/usr/sbin/xl', 'destroy', self.name])
#xc.domain_destroy(self.get_xid())
def remove_from_disk(self):
if dry_run:
return
shutil.rmtree (self.dir_path)
def get_xml_attrs(self):
attrs = {}
attrs["qid"] = str(self.qid)
attrs["name"] = self.name
attrs["dir_path"] = self.dir_path
attrs["conf_file"] = self.conf_file
attrs["root_img"] = self.root_img
attrs["volatile_img"] = self.volatile_img
attrs["private_img"] = self.private_img
attrs["uses_default_netvm"] = str(self.uses_default_netvm)
attrs["netvm_qid"] = str(self.netvm_vm.qid) if self.netvm_vm is not None else "none"
attrs["installed_by_rpm"] = str(self.installed_by_rpm)
attrs["template_qid"] = str(self.template_vm.qid) if self.template_vm and not self.is_updateable() else "none"
attrs["updateable"] = str(self.updateable)
attrs["label"] = self.label.name
attrs["memory"] = str(self.memory)
attrs["maxmem"] = str(self.maxmem)
attrs["pcidevs"] = str(self.pcidevs)
attrs["vcpus"] = str(self.vcpus)
attrs["internal"] = str(self.internal)
attrs["uses_default_kernel"] = str(self.uses_default_kernel)
attrs["kernel"] = str(self.kernel)
attrs["uses_default_kernelopts"] = str(self.uses_default_kernelopts)
attrs["kernelopts"] = str(self.kernelopts)
attrs["services"] = str(self.services)
return attrs
def create_xml_element(self):
# Compatibility hack (Qubes*VM in type vs Qubes*Vm in XML)...
rx_type = re.compile (r"VM")
attrs = self.get_xml_attrs()
element = xml.etree.ElementTree.Element(
"Qubes" + rx_type.sub("Vm", self.type),
**attrs)
return element
class QubesTemplateVm(QubesVm):
"""
A class that represents an TemplateVM. A child of QubesVm.
"""
def __init__(self, **kwargs):
if "dir_path" not in kwargs or kwargs["dir_path"] is None:
kwargs["dir_path"] = qubes_templates_dir + "/" + kwargs["name"]
if "updateable" not in kwargs or kwargs["updateable"] is None :
kwargs["updateable"] = True
if "label" not in kwargs or kwargs["label"] == None:
kwargs["label"] = default_template_label
super(QubesTemplateVm, self).__init__(**kwargs)
dir_path = kwargs["dir_path"]
# Clean image for root-cow and swap (AppVM side)
self.clean_volatile_img = self.dir_path + "/" + default_clean_volatile_img
# Image for template changes
self.rootcow_img = self.dir_path + "/" + default_rootcow_img
self.appmenus_templates_dir = self.dir_path + "/" + default_appmenus_templates_subdir
self.appvms = QubesVmCollection()
@property
def type(self):
return "TemplateVM"
def set_updateable(self):
if self.is_updateable():
return
assert not self.is_running()
# Make sure that all the AppVMs are non-updateable...
for appvm in self.appvms.values():
if appvm.is_updateable():
raise QubesException("One of the AppVMs ('{0}')is also 'updateable'\
-- cannot make the TemplateVM {'{1}'} 'nonupdatable'".\
format (appvm.name, self.name))
self.updateable = True
def get_rootdev(self, source_template=None):
return "'script:origin:{dir}/root.img:{dir}/root-cow.img,xvda,w',".format(dir=self.dir_path)
def clone_disk_files(self, src_template_vm, verbose):
if dry_run:
return
assert not src_template_vm.is_running(), "Attempt to clone a running Template VM!"
if verbose:
print >> sys.stderr, "--> Creating directory: {0}".format(self.dir_path)
os.mkdir (self.dir_path)
if verbose:
print >> sys.stderr, "--> Copying the template's private image:\n{0} ==>\n{1}".\
format(src_template_vm.private_img, self.private_img)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", src_template_vm.private_img, self.private_img])
if retcode != 0:
raise IOError ("Error while copying {0} to {1}".\
format(src_template_vm.private_img, self.private_img))
if verbose:
print >> sys.stderr, "--> Copying the template's root image:\n{0} ==>\n{1}".\
format(src_template_vm.root_img, self.root_img)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", src_template_vm.root_img, self.root_img])
if retcode != 0:
raise IOError ("Error while copying {0} to {1}".\
format(src_template_vm.root_img, self.root_img))
if verbose:
print >> sys.stderr, "--> Copying the template's clean volatile image:\n{0} ==>\n{1}".\
format(src_template_vm.clean_volatile_img, self.clean_volatile_img)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", src_template_vm.clean_volatile_img, self.clean_volatile_img])
if retcode != 0:
raise IOError ("Error while copying {0} to {1}".\
format(src_template_vm.clean_volatile_img, self.clean_volatile_img))
if verbose:
print >> sys.stderr, "--> Copying the template's volatile image:\n{0} ==>\n{1}".\
format(self.clean_volatile_img, self.volatile_img)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", self.clean_volatile_img, self.volatile_img])
if retcode != 0:
raise IOError ("Error while copying {0} to {1}".\
format(self.clean_volatile_img, self.volatile_img))
if verbose:
print >> sys.stderr, "--> Copying the template's DispVM prerun script..."
retcode = subprocess.call (["cp", src_template_vm.dir_path + '/dispvm-prerun.sh', self.dir_path + '/dispvm-prerun.sh'])
if retcode != 0:
raise IOError ("Error while copying DispVM prerun script")
if verbose:
print >> sys.stderr, "--> Copying the template's appmenus templates dir:\n{0} ==>\n{1}".\
format(src_template_vm.appmenus_templates_dir, self.appmenus_templates_dir)
shutil.copytree (src_template_vm.appmenus_templates_dir, self.appmenus_templates_dir)
if os.path.exists(src_template_vm.dir_path + '/' + qubes_whitelisted_appmenus):
if verbose:
print >> sys.stderr, "--> Copying whitelisted apps list: {0}".\
format(self.dir_path + '/' + qubes_whitelisted_appmenus)
shutil.copy(src_template_vm.dir_path + '/' + qubes_whitelisted_appmenus,
self.dir_path + '/' + qubes_whitelisted_appmenus)
if os.path.exists(src_template_vm.dir_path + '/vm-' + qubes_whitelisted_appmenus):
if verbose:
print >> sys.stderr, "--> Copying default whitelisted apps list: {0}".\
format(self.dir_path + '/vm-' + qubes_whitelisted_appmenus)
shutil.copy(src_template_vm.dir_path + '/vm-' + qubes_whitelisted_appmenus,
self.dir_path + '/vm-' + qubes_whitelisted_appmenus)
icon_path = "/usr/share/qubes/icons/template.png"
if verbose:
print >> sys.stderr, "--> Creating icon symlink: {0} -> {1}".format(self.icon_path, icon_path)
os.symlink (icon_path, self.icon_path)
# Create root-cow.img
self.commit_changes(verbose=verbose)
# Create appmenus
self.create_appmenus(verbose, source_template = src_template_vm)
def create_appmenus(self, verbose, source_template = None):
if source_template is None:
source_template = self.template_vm
try:
subprocess.check_call ([qubes_appmenu_create_cmd, self.appmenus_templates_dir, self.name, "vm-templates"])
except subprocess.CalledProcessError:
print >> sys.stderr, "Ooops, there was a problem creating appmenus for {0} VM!".format (self.name)
def remove_from_disk(self):
if dry_run:
return
subprocess.check_call ([qubes_appmenu_remove_cmd, self.name, "vm-templates"])
super(QubesTemplateVm, self).remove_from_disk()
def verify_files(self):
if dry_run:
return
if not os.path.exists (self.dir_path):
raise QubesException (
"VM directory doesn't exist: {0}".\
format(self.dir_path))
if not os.path.exists (self.root_img):
raise QubesException (
"VM root image file doesn't exist: {0}".\
format(self.root_img))
if not os.path.exists (self.private_img):
raise QubesException (
"VM private image file doesn't exist: {0}".\
format(self.private_img))
if not os.path.exists (self.volatile_img):
raise QubesException (
"VM volatile image file doesn't exist: {0}".\
format(self.volatile_img))
if not os.path.exists (self.clean_volatile_img):
raise QubesException (
"Clean VM volatile image file doesn't exist: {0}".\
format(self.clean_volatile_img))
if not os.path.exists (self.kernels_dir):
raise QubesException (
"VM's kernels directory does not exist: {0}".\
format(self.kernels_dir))
return True
def start(self, debug_console = False, verbose = False, preparing_dvm=False):
if dry_run:
return
self.reset_volatile_storage(verbose=verbose)
if not self.is_updateable():
raise QubesException ("Cannot start Template VM that is marked \"nonupdatable\"")
# TODO?: check if none of running appvms are outdated
return super(QubesTemplateVm, self).start(debug_console=debug_console, verbose=verbose)
def reset_volatile_storage(self, verbose = False):
assert not self.is_running(), "Attempt to clean volatile image of running Template VM!"
if verbose:
print >> sys.stderr, "--> Cleaning volatile image: {0}...".format (self.volatile_img)
if dry_run:
return
if os.path.exists (self.volatile_img):
os.remove (self.volatile_img)
retcode = subprocess.call (["tar", "xf", self.clean_volatile_img, "-C", self.dir_path])
if retcode != 0:
raise IOError ("Error while unpacking {0} to {1}".\
format(self.template_vm.clean_volatile_img, self.volatile_img))
def commit_changes (self, verbose = False):
assert not self.is_running(), "Attempt to commit changes on running Template VM!"
if verbose:
print >> sys.stderr, "--> Commiting template updates... COW: {0}...".format (self.rootcow_img)
if dry_run:
return
if os.path.exists (self.rootcow_img):
os.rename (self.rootcow_img, self.rootcow_img + '.old')
f_cow = open (self.rootcow_img, "w")
f_root = open (self.root_img, "r")
f_root.seek(0, os.SEEK_END)
f_cow.truncate (f_root.tell()) # make empty sparse file of the same size as root.img
f_cow.close ()
f_root.close()
def get_xml_attrs(self):
attrs = super(QubesTemplateVm, self).get_xml_attrs()
attrs["clean_volatile_img"] = self.clean_volatile_img
attrs["rootcow_img"] = self.rootcow_img
return attrs
class QubesNetVm(QubesVm):
"""
A class that represents a NetVM. A child of QubesCowVM.
"""
def __init__(self, **kwargs):
netid = kwargs.pop("netid")
self.netid = netid
self.__network = "10.137.{0}.0".format(netid)
self.netprefix = "10.137.{0}.".format(netid)
self.dispnetprefix = "10.138.{0}.".format(netid)
self.__netmask = vm_default_netmask
self.__gateway = self.netprefix + "1"
self.__secondary_dns = self.netprefix + "254"
if "dir_path" not in kwargs or kwargs["dir_path"] is None:
kwargs["dir_path"] = qubes_servicevms_dir + "/" + kwargs["name"]
self.__external_ip_allowed_xids = set()
if "label" not in kwargs or kwargs["label"] is None:
kwargs["label"] = default_servicevm_label
if "vcpus" not in kwargs or kwargs["vcpus"] is None:
kwargs["vcpus"] = default_servicevm_vcpus
if "memory" not in kwargs or kwargs["memory"] is None:
kwargs["memory"] = 200
kwargs["maxmem"] = kwargs["memory"]
super(QubesNetVm, self).__init__(**kwargs)
self.connected_vms = QubesVmCollection()
@property
def type(self):
return "NetVM"
@property
def gateway(self):
return self.__gateway
@property
def secondary_dns(self):
return self.__secondary_dns
@property
def netmask(self):
return self.__netmask
@property
def network(self):
return self.__network
def get_ip_for_vm(self, qid):
lo = qid % 253 + 2
assert lo >= 2 and lo <= 254, "Wrong IP address for VM"
return self.netprefix + "{0}".format(lo)
def get_ip_for_dispvm(self, dispid):
lo = dispid % 254 + 1
assert lo >= 1 and lo <= 254, "Wrong IP address for VM"
return self.dispnetprefix + "{0}".format(lo)
def create_xenstore_entries(self, xid = None):
if dry_run:
return
if xid is None:
xid = self.xid
super(QubesNetVm, self).create_xenstore_entries(xid)
xs.write('', "/local/domain/{0}/qubes_netvm_external_ip".format(xid), '')
self.update_external_ip_permissions(xid)
def update_external_ip_permissions(self, xid = -1):
if xid < 0:
xid = self.get_xid()
if xid < 0:
return
command = [
"/usr/bin/xenstore-chmod",
"/local/domain/{0}/qubes_netvm_external_ip".format(xid)
]
command.append("n{0}".format(xid))
for id in self.__external_ip_allowed_xids:
command.append("r{0}".format(id))
return subprocess.check_call(command)
def start(self, debug_console = False, verbose = False, preparing_dvm=False):
if dry_run:
return
xid=super(QubesNetVm, self).start(debug_console=debug_console, verbose=verbose)
# Connect vif's of already running VMs
for vm in self.connected_vms.values():
if not vm.is_running():
continue
if verbose:
print >> sys.stderr, "--> Attaching network to '{0}'...".format(vm.name)
# Cleanup stale VIFs
vm.cleanup_vifs()
# wait for frontend to forget about this device (UGLY HACK)
time.sleep(0.2)
try:
vm.attach_network(wait=False)
except QubesException as ex:
print >> sys.stderr, ("WARNING: Cannot attach to network to '{0}': {1}".format(vm.name, ex))
return xid
def shutdown(self, force=False):
if dry_run:
return
connected_vms = [vm for vm in self.connected_vms.values() if vm.is_running()]
if connected_vms and not force:
raise QubesException("There are other VMs connected to this VM: " + str([vm.name for vm in connected_vms]))
super(QubesNetVm, self).shutdown(force=force)
def add_external_ip_permission(self, xid):
if int(xid) < 0:
return
self.__external_ip_allowed_xids.add(int(xid))
self.update_external_ip_permissions()
def remove_external_ip_permission(self, xid):
self.__external_ip_allowed_xids.discard(int(xid))
self.update_external_ip_permissions()
def get_xml_attrs(self):
attrs = super(QubesNetVm, self).get_xml_attrs()
attrs.pop("netvm_qid")
attrs.pop("uses_default_netvm")
attrs["netid"] = str(self.netid)
return attrs
class QubesProxyVm(QubesNetVm):
"""
A class that represents a ProxyVM, ex FirewallVM. A child of QubesNetVM.
"""
def __init__(self, **kwargs):
kwargs["uses_default_netvm"] = False
super(QubesProxyVm, self).__init__(**kwargs)
self.rules_applied = None
@property
def type(self):
return "ProxyVM"
def start(self, debug_console = False, verbose = False, preparing_dvm = False):
if dry_run:
return
retcode = super(QubesProxyVm, self).start(debug_console=debug_console, verbose=verbose, preparing_dvm=preparing_dvm)
self.netvm_vm.add_external_ip_permission(self.get_xid())
self.write_netvm_domid_entry()
return retcode
def force_shutdown(self):
if dry_run:
return
self.netvm_vm.remove_external_ip_permission(self.get_xid())
super(QubesProxyVm, self).force_shutdown()
def create_xenstore_entries(self, xid = None):
if dry_run:
return
if xid is None:
xid = self.xid
super(QubesProxyVm, self).create_xenstore_entries(xid)
xs.write('', "/local/domain/{0}/qubes_iptables_error".format(xid), '')
xs.set_permissions('', "/local/domain/{0}/qubes_iptables_error".format(xid),
[{ 'dom': xid, 'write': True }])
self.write_iptables_xenstore_entry()
def write_netvm_domid_entry(self, xid = -1):
if xid < 0:
xid = self.get_xid()
xs.write('', "/local/domain/{0}/qubes_netvm_domid".format(xid),
"{0}".format(self.netvm_vm.get_xid()))
def write_iptables_xenstore_entry(self):
xs.rm('', "/local/domain/{0}/qubes_iptables_domainrules".format(self.get_xid()))
iptables = "# Generated by Qubes Core on {0}\n".format(datetime.now().ctime())
iptables += "*filter\n"
iptables += ":INPUT DROP [0:0]\n"
iptables += ":FORWARD DROP [0:0]\n"
iptables += ":OUTPUT ACCEPT [0:0]\n"
# Strict INPUT rules
iptables += "-A INPUT -i vif+ -p udp -m udp --dport 68 -j DROP\n"
iptables += "-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT\n"
iptables += "-A INPUT -p icmp -j ACCEPT\n"
iptables += "-A INPUT -i lo -j ACCEPT\n"
iptables += "-A INPUT -j REJECT --reject-with icmp-host-prohibited\n"
iptables += "-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT\n"
# Allow dom0 networking
iptables += "-A FORWARD -i vif0.0 -j ACCEPT\n"
# Deny inter-VMs networking
iptables += "-A FORWARD -i vif+ -o vif+ -j DROP\n"
iptables += "COMMIT\n"
xs.write('', "/local/domain/{0}/qubes_iptables_header".format(self.get_xid()), iptables)
vms = [vm for vm in self.connected_vms.values()]
for vm in vms:
iptables="*filter\n"
if vm.has_firewall():
conf = vm.get_firewall_conf()
else:
conf = { "rules": list(), "allow": True, "allowDns": True, "allowIcmp": True }
xid = vm.get_xid()
if xid < 0: # VM not active ATM
continue
iptables += "# '{0}' VM:\n".format(vm.name)
iptables += "-A FORWARD ! -s {0}/32 -i vif{1}.+ -j DROP\n".format(vm.ip, xid)
accept_action = "ACCEPT"
reject_action = "REJECT --reject-with icmp-host-prohibited"
if conf["allow"]:
default_action = accept_action
rules_action = reject_action
else:
default_action = reject_action
rules_action = accept_action
for rule in conf["rules"]:
iptables += "-A FORWARD -i vif{0}.+ -d {1}".format(xid, rule["address"])
if rule["netmask"] != 32:
iptables += "/{0}".format(rule["netmask"])
if rule["portBegin"] is not None and rule["portBegin"] > 0:
iptables += " -p tcp --dport {0}".format(rule["portBegin"])
if rule["portEnd"] is not None and rule["portEnd"] > rule["portBegin"]:
iptables += ":{0}".format(rule["portEnd"])
iptables += " -j {0}\n".format(rules_action)
if conf["allowDns"]:
# PREROUTING does DNAT to NetVM DNSes, so we need self.netvm_vm. properties
iptables += "-A FORWARD -i vif{0}.+ -p udp -d {1} --dport 53 -j ACCEPT\n".format(xid,self.netvm_vm.gateway)
iptables += "-A FORWARD -i vif{0}.+ -p udp -d {1} --dport 53 -j ACCEPT\n".format(xid,self.netvm_vm.secondary_dns)
if conf["allowIcmp"]:
iptables += "-A FORWARD -i vif{0}.+ -p icmp -j ACCEPT\n".format(xid)
iptables += "-A FORWARD -i vif{0}.+ -j {1}\n".format(xid, default_action)
iptables += "COMMIT\n"
xs.write('', "/local/domain/"+str(self.get_xid())+"/qubes_iptables_domainrules/"+str(xid), iptables)
# no need for ending -A FORWARD -j DROP, cause default action is DROP
self.write_netvm_domid_entry()
self.rules_applied = None
xs.write('', "/local/domain/{0}/qubes_iptables".format(self.get_xid()), 'reload')
def get_xml_attrs(self):
attrs = super(QubesProxyVm, self).get_xml_attrs()
attrs["netvm_qid"] = str(self.netvm_vm.qid) if self.netvm_vm is not None else "none"
return attrs
class QubesDom0NetVm(QubesNetVm):
def __init__(self):
super(QubesDom0NetVm, self).__init__(qid=0, name="dom0", netid=0,
dir_path=None,
private_img = None,
template_vm = None,
label = default_template_label)
self.xid = 0
def is_running(self):
return True
def get_xid(self):
return 0
def get_power_state(self):
return "Running"
def get_disk_usage(self, file_or_dir):
return 0
def get_disk_utilization(self):
return 0
def get_disk_utilization_private_img(self):
return 0
def get_private_img_sz(self):
return 0
@property
def ip(self):
return "10.137.0.1"
def start(self, debug_console = False, verbose = False):
raise QubesException ("Cannot start Dom0 fake domain!")
def get_xl_dominfo(self):
if dry_run:
return
domains = xl_ctx.list_domains()
for dominfo in domains:
if dominfo.domid == 0:
return dominfo
return None
def get_xc_dominfo(self):
if dry_run:
return
domains = xc.domain_getinfo(0, 1)
return domains[0]
def create_xml_element(self):
return None
def verify_files(self):
return True
class QubesDisposableVm(QubesVm):
"""
A class that represents an DisposableVM. A child of QubesVm.
"""
def __init__(self, **kwargs):
template_vm = kwargs["template_vm"]
assert template_vm is not None, "Missing template_vm for DisposableVM!"
self.dispid = kwargs.pop("dispid")
super(QubesDisposableVm, self).__init__(dir_path="/nonexistent", **kwargs)
@property
def type(self):
return "DisposableVM"
@property
def ip(self):
if self.netvm_vm is not None:
return self.netvm_vm.get_ip_for_dispvm(self.dispid)
else:
return None
def get_xml_attrs(self):
attrs = {}
attrs["qid"] = str(self.qid)
attrs["name"] = self.name
attrs["dispid"] = str(self.dispid)
attrs["template_qid"] = str(self.template_vm.qid)
attrs["label"] = self.label.name
return attrs
def verify_files(self):
return True
class QubesAppVm(QubesVm):
"""
A class that represents an AppVM. A child of QubesVm.
"""
def __init__(self, **kwargs):
if "dir_path" not in kwargs or kwargs["dir_path"] is None:
kwargs["dir_path"] = qubes_appvms_dir + "/" + kwargs["name"]
super(QubesAppVm, self).__init__(**kwargs)
@property
def type(self):
return "AppVM"
def create_on_disk(self, verbose, source_template = None):
if dry_run:
return
super(QubesAppVm, self).create_on_disk(verbose, source_template=source_template)
if self.is_updateable():
if verbose:
print >> sys.stderr, "--> Copying the template's appmenus templates dir:\n{0} ==>\n{1}".\
format(source_template.appmenus_templates_dir, self.appmenus_templates_dir)
shutil.copytree (source_template.appmenus_templates_dir, self.appmenus_templates_dir)
if verbose:
print >> sys.stderr, "--> Creating icon symlink: {0} -> {1}".format(self.icon_path, self.label.icon_path)
os.symlink (self.label.icon_path, self.icon_path)
if not self.internal:
self.create_appmenus (verbose, source_template=source_template)
def remove_from_disk(self):
if dry_run:
return
vmtype = ''
if self.is_netvm():
vmtype = 'servicevms'
else:
vmtype = 'appvms'
subprocess.check_call ([qubes_appmenu_remove_cmd, self.name, vmtype])
super(QubesAppVm, self).remove_from_disk()
class QubesVmCollection(dict):
"""
A collection of Qubes VMs indexed by Qubes id (qid)
"""
def __init__(self, store_filename=qubes_store_filename):
super(QubesVmCollection, self).__init__()
self.default_netvm_qid = None
self.default_fw_netvm_qid = None
self.default_template_qid = None
self.default_kernel = None
self.updatevm_qid = None
self.qubes_store_filename = store_filename
self.clockvm_qid = None
def values(self):
for qid in self.keys():
yield self[qid]
def items(self):
for qid in self.keys():
yield (qid, self[qid])
def __iter__(self):
for qid in sorted(super(QubesVmCollection, self).keys()):
yield qid
keys = __iter__
def __setitem__(self, key, value):
if key not in self:
return super(QubesVmCollection, self).__setitem__(key, value)
else:
assert False, "Attempt to add VM with qid that already exists in the collection!"
def add_new_appvm(self, name, template_vm,
dir_path = None, conf_file = None,
private_img = None,
updateable = False,
label = None):
qid = self.get_new_unused_qid()
vm = QubesAppVm (qid=qid, name=name, template_vm=template_vm,
dir_path=dir_path, conf_file=conf_file,
private_img=private_img,
netvm_vm = self.get_default_netvm_vm(),
kernel = self.get_default_kernel(),
uses_default_kernel = True,
updateable=updateable,
label=label)
if not self.verify_new_vm (vm):
assert False, "Wrong VM description!"
self[vm.qid]=vm
return vm
def add_new_disposablevm(self, name, template_vm, dispid,
label = None):
qid = self.get_new_unused_qid()
vm = QubesDisposableVm (qid=qid, name=name, template_vm=template_vm,
netvm_vm = self.get_default_netvm_vm(),
label=label, dispid=dispid)
if not self.verify_new_vm (vm):
assert False, "Wrong VM description!"
self[vm.qid]=vm
return vm
def add_new_templatevm(self, name,
dir_path = None, conf_file = None,
root_img = None, private_img = None,
installed_by_rpm = True):
qid = self.get_new_unused_qid()
vm = QubesTemplateVm (qid=qid, name=name,
dir_path=dir_path, conf_file=conf_file,
root_img=root_img, private_img=private_img,
installed_by_rpm=installed_by_rpm,
netvm_vm = self.get_default_netvm_vm(),
kernel = self.get_default_kernel(),
uses_default_kernel = True)
if not self.verify_new_vm (vm):
assert False, "Wrong VM description!"
self[vm.qid]=vm
if self.default_template_qid is None:
self.set_default_template_vm(vm)
return vm
def clone_templatevm(self, src_template_vm, name, dir_path = None, verbose = False):
assert not src_template_vm.is_running(), "Attempt to clone a running Template VM!"
vm = self.add_new_templatevm (name=name, dir_path=dir_path, installed_by_rpm = False)
return vm
def add_new_netvm(self, name, template_vm,
dir_path = None, conf_file = None,
private_img = None, installed_by_rpm = False,
label = None, updateable = False):
qid = self.get_new_unused_qid()
netid = self.get_new_unused_netid()
vm = QubesNetVm (qid=qid, name=name, template_vm=template_vm,
netid=netid, label=label,
private_img=private_img, installed_by_rpm=installed_by_rpm,
updateable=updateable,
kernel = self.get_default_kernel(),
uses_default_kernel = True,
dir_path=dir_path, conf_file=conf_file)
if not self.verify_new_vm (vm):
assert False, "Wrong VM description!"
self[vm.qid]=vm
if self.default_fw_netvm_qid is None:
self.set_default_fw_netvm_vm(vm)
return vm
def add_new_proxyvm(self, name, template_vm,
dir_path = None, conf_file = None,
private_img = None, installed_by_rpm = False,
label = None, updateable = False):
qid = self.get_new_unused_qid()
netid = self.get_new_unused_netid()
vm = QubesProxyVm (qid=qid, name=name, template_vm=template_vm,
netid=netid, label=label,
private_img=private_img, installed_by_rpm=installed_by_rpm,
dir_path=dir_path, conf_file=conf_file,
updateable=updateable,
kernel = self.get_default_kernel(),
uses_default_kernel = True,
netvm_vm = self.get_default_fw_netvm_vm())
if not self.verify_new_vm (vm):
assert False, "Wrong VM description!"
self[vm.qid]=vm
if self.default_netvm_qid is None:
self.set_default_netvm_vm(vm)
if self.updatevm_qid is None:
self.set_updatevm_vm(vm)
return vm
def set_default_template_vm(self, vm):
assert vm.is_template(), "VM {0} is not a TemplateVM!".format(vm.name)
self.default_template_qid = vm.qid
def get_default_template_vm(self):
if self.default_template_qid is None:
return None
else:
return self[self.default_template_qid]
def set_default_netvm_vm(self, vm):
assert vm.is_netvm(), "VM {0} does not provide network!".format(vm.name)
self.default_netvm_qid = vm.qid
def get_default_netvm_vm(self):
if self.default_netvm_qid is None:
return None
else:
return self[self.default_netvm_qid]
def set_default_kernel(self, kernel):
assert os.path.exists(qubes_kernels_base_dir + '/' + kernel), "Kerel {0} not installed!".format(kernel)
self.default_kernel = kernel
def get_default_kernel(self):
return self.default_kernel
def set_default_fw_netvm_vm(self, vm):
assert vm.is_netvm(), "VM {0} does not provide network!".format(vm.name)
self.default_fw_netvm_qid = vm.qid
def get_default_fw_netvm_vm(self):
if self.default_fw_netvm_qid is None:
return None
else:
return self[self.default_fw_netvm_qid]
def set_updatevm_vm(self, vm):
self.updatevm_qid = vm.qid
def get_updatevm_vm(self):
if self.updatevm_qid is None:
return None
else:
return self[self.updatevm_qid]
def set_clockvm_vm(self, vm):
self.clockvm_qid = vm.qid
def get_clockvm_vm(self):
if self.clockvm_qid is None:
return None
else:
return self[self.clockvm_qid]
def get_vm_by_name(self, name):
for vm in self.values():
if (vm.name == name):
return vm
return None
def get_qid_by_name(self, name):
vm = self.get_vm_by_name(name)
return vm.qid if vm is not None else None
def get_vms_based_on(self, template_qid):
vms = set([vm for vm in self.values()
if (vm.template_vm and vm.template_vm.qid == template_qid)])
return vms
def get_vms_connected_to(self, netvm_qid):
new_vms = [ netvm_qid ]
dependend_vms_qid = []
# Dependency resolving only makes sense on NetVM (or derivative)
if not self[netvm_qid].is_netvm():
return set([])
while len(new_vms) > 0:
cur_vm = new_vms.pop()
for vm in self[cur_vm].connected_vms.values():
if vm.qid not in dependend_vms_qid:
dependend_vms_qid.append(vm.qid)
if vm.is_netvm():
new_vms.append(vm.qid)
vms = [vm for vm in self.values() if vm.qid in dependend_vms_qid]
return vms
def verify_new_vm(self, new_vm):
# Verify that qid is unique
for vm in self.values():
if vm.qid == new_vm.qid:
print >> sys.stderr, "ERROR: The qid={0} is already used by VM '{1}'!".\
format(vm.qid, vm.name)
return False
# Verify that name is unique
for vm in self.values():
if vm.name == new_vm.name:
print >> sys.stderr, "ERROR: The name={0} is already used by other VM with qid='{1}'!".\
format(vm.name, vm.qid)
return False
return True
def get_new_unused_qid(self):
used_ids = set([vm.qid for vm in self.values()])
for id in range (1, qubes_max_qid):
if id not in used_ids:
return id
raise LookupError ("Cannot find unused qid!")
def get_new_unused_netid(self):
used_ids = set([vm.netid for vm in self.values() if vm.is_netvm()])
for id in range (1, qubes_max_netid):
if id not in used_ids:
return id
raise LookupError ("Cannot find unused netid!")
def check_if_storage_exists(self):
try:
f = open (self.qubes_store_filename, 'r')
except IOError:
return False
f.close()
return True
def create_empty_storage(self):
self.qubes_store_file = open (self.qubes_store_filename, 'w')
self.clear()
self.save()
def lock_db_for_reading(self):
self.qubes_store_file = open (self.qubes_store_filename, 'r')
fcntl.lockf (self.qubes_store_file, fcntl.LOCK_SH)
def lock_db_for_writing(self):
self.qubes_store_file = open (self.qubes_store_filename, 'r+')
fcntl.lockf (self.qubes_store_file, fcntl.LOCK_EX)
def unlock_db(self):
fcntl.lockf (self.qubes_store_file, fcntl.LOCK_UN)
self.qubes_store_file.close()
def save(self):
root = xml.etree.ElementTree.Element(
"QubesVmCollection",
default_template=str(self.default_template_qid) \
if self.default_template_qid is not None else "None",
default_netvm=str(self.default_netvm_qid) \
if self.default_netvm_qid is not None else "None",
default_fw_netvm=str(self.default_fw_netvm_qid) \
if self.default_fw_netvm_qid is not None else "None",
updatevm=str(self.updatevm_qid) \
if self.updatevm_qid is not None else "None",
clockvm=str(self.clockvm_qid) \
if self.clockvm_qid is not None else "None",
default_kernel=str(self.default_kernel) \
if self.default_kernel is not None else "None",
)
for vm in self.values():
element = vm.create_xml_element()
if element is not None:
root.append(element)
tree = xml.etree.ElementTree.ElementTree(root)
try:
# We need to manually truncate the file, as we open the
# file as "r+" in the lock_db_for_writing() function
self.qubes_store_file.seek (0, os.SEEK_SET)
self.qubes_store_file.truncate()
tree.write(self.qubes_store_file, "UTF-8")
except EnvironmentError as err:
print("{0}: export error: {1}".format(
os.path.basename(sys.argv[0]), err))
return False
return True
def parse_xml_element(self, element):
kwargs = {}
common_attr_list = ("qid", "name", "dir_path", "conf_file",
"private_img", "root_img", "template_qid",
"installed_by_rpm", "updateable", "internal",
"uses_default_netvm", "label", "memory", "vcpus", "pcidevs",
"maxmem", "kernel", "uses_default_kernel", "kernelopts", "uses_default_kernelopts",
"services" )
for attribute in common_attr_list:
kwargs[attribute] = element.get(attribute)
if kwargs[attribute] is None:
kwargs.pop(attribute)
kwargs["qid"] = int(kwargs["qid"])
if "updateable" in kwargs:
kwargs["updateable"] = True if kwargs["updateable"] == "True" else False
if "installed_by_rpm" in kwargs:
kwargs["installed_by_rpm"] = True if kwargs["installed_by_rpm"] == "True" else False
if "internal" in kwargs:
kwargs["internal"] = True if kwargs["internal"] == "True" else False
if "template_qid" in kwargs:
if kwargs["template_qid"] == "none" or kwargs["template_qid"] is None:
kwargs.pop("template_qid")
else:
kwargs["template_qid"] = int(kwargs["template_qid"])
template_vm = self[kwargs.pop("template_qid")]
if template_vm is None:
print >> sys.stderr, "ERROR: VM '{0}' uses unkown template qid='{1}'!".\
format(kwargs["name"], kwargs["template_qid"])
else:
kwargs["template_vm"] = template_vm
if "label" in kwargs:
if kwargs["label"] not in QubesVmLabels:
print >> sys.stderr, "ERROR: incorrect label for VM '{0}'".format(kwargs["name"])
kwargs.pop ("label")
else:
kwargs["label"] = QubesVmLabels[kwargs["label"]]
if "kernel" in kwargs and kwargs["kernel"] == "None":
kwargs["kernel"] = None
if "uses_default_kernel" in kwargs:
kwargs["uses_default_kernel"] = True if kwargs["uses_default_kernel"] == "True" else False
else:
# For backward compatibility
kwargs["uses_default_kernel"] = False
if kwargs["uses_default_kernel"]:
kwargs["kernel"] = self.get_default_kernel()
else:
if "kernel" in kwargs and kwargs["kernel"]=="None":
kwargs["kernel"]=None
# for other cases - generic assigment is ok
if "uses_default_kernelopts" in kwargs:
kwargs["uses_default_kernelopts"] = False if kwargs["uses_default_kernelopts"] == "False" else True
if "kernelopts" not in kwargs or kwargs["kernelopts"] == "None":
kwargs.pop("kernelopts")
kwargs["uses_default_kernelopts"] = True
return kwargs
def set_netvm_dependency(self, element):
kwargs = {}
attr_list = ("qid", "uses_default_netvm", "netvm_qid")
for attribute in attr_list:
kwargs[attribute] = element.get(attribute)
vm = self[int(kwargs["qid"])]
if "uses_default_netvm" not in kwargs:
vm.uses_default_netvm = True
else:
vm.uses_default_netvm = True if kwargs["uses_default_netvm"] == "True" else False
if vm.uses_default_netvm is True:
netvm_vm = self.get_default_netvm_vm()
kwargs.pop("netvm_qid")
else:
if kwargs["netvm_qid"] == "none" or kwargs["netvm_qid"] is None:
netvm_vm = None
kwargs.pop("netvm_qid")
else:
netvm_qid = int(kwargs.pop("netvm_qid"))
if netvm_qid not in self:
netvm_vm = None
else:
netvm_vm = self[netvm_qid]
vm.netvm_vm = netvm_vm
if netvm_vm:
netvm_vm.connected_vms[vm.qid] = vm
def load(self):
self.clear()
dom0vm = QubesDom0NetVm ()
self[dom0vm.qid] = dom0vm
self.default_netvm_qid = 0
global dom0_vm
dom0_vm = dom0vm
try:
tree = xml.etree.ElementTree.parse(self.qubes_store_file)
except (EnvironmentError,
xml.parsers.expat.ExpatError) as err:
print("{0}: import error: {1}".format(
os.path.basename(sys.argv[0]), err))
return False
element = tree.getroot()
default_template = element.get("default_template")
self.default_template_qid = int(default_template) \
if default_template != "None" else None
default_netvm = element.get("default_netvm")
if default_netvm is not None:
self.default_netvm_qid = int(default_netvm) \
if default_netvm != "None" else None
#assert self.default_netvm_qid is not None
default_fw_netvm = element.get("default_fw_netvm")
if default_fw_netvm is not None:
self.default_fw_netvm_qid = int(default_fw_netvm) \
if default_fw_netvm != "None" else None
#assert self.default_netvm_qid is not None
updatevm = element.get("updatevm")
if updatevm is not None:
self.updatevm_qid = int(updatevm) \
if updatevm != "None" else None
#assert self.default_netvm_qid is not None
clockvm = element.get("clockvm")
if clockvm is not None:
self.clockvm_qid = int(clockvm) \
if clockvm != "None" else None
self.default_kernel = element.get("default_kernel")
# Then, read in the TemplateVMs, because a reference to template VM
# is needed to create each AppVM
for element in tree.findall("QubesTemplateVm"):
try:
kwargs = self.parse_xml_element(element)
vm = QubesTemplateVm(**kwargs)
self[vm.qid] = vm
except (ValueError, LookupError) as err:
print("{0}: import error (QubesTemplateVm): {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# Read in the NetVMs first, because a reference to NetVM
# is needed to create all other VMs
for element in tree.findall("QubesNetVm"):
try:
kwargs = self.parse_xml_element(element)
# Add NetVM specific fields
attr_list = ("netid",)
for attribute in attr_list:
kwargs[attribute] = element.get(attribute)
kwargs["netid"] = int(kwargs["netid"])
vm = QubesNetVm(**kwargs)
self[vm.qid] = vm
except (ValueError, LookupError) as err:
print("{0}: import error (QubesNetVM) {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# Next read in the ProxyVMs, because they may be referenced
# by other VMs
for element in tree.findall("QubesProxyVm"):
try:
kwargs = self.parse_xml_element(element)
# Add ProxyVM specific fields
attr_list = ("netid",)
for attribute in attr_list:
kwargs[attribute] = element.get(attribute)
kwargs["netid"] = int(kwargs["netid"])
vm = QubesProxyVm(**kwargs)
self[vm.qid] = vm
except (ValueError, LookupError) as err:
print("{0}: import error (QubesProxyVM) {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# After importing all NetVMs and ProxyVMs, set netvm references
# 1. For TemplateVMs
for element in tree.findall("QubesTemplateVm"):
try:
self.set_netvm_dependency(element)
except (ValueError, LookupError) as err:
print("{0}: import error (QubesTemplateVm): {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# 2. For PoxyVMs
for element in tree.findall("QubesProxyVm"):
try:
self.set_netvm_dependency(element)
except (ValueError, LookupError) as err:
print("{0}: import error (QubesProxyVM) {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# Finally, read in the AppVMs
for element in tree.findall("QubesAppVm"):
try:
kwargs = self.parse_xml_element(element)
vm = QubesAppVm(**kwargs)
self[vm.qid] = vm
self.set_netvm_dependency(element)
except (ValueError, LookupError) as err:
print("{0}: import error (QubesAppVm): {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# Really finally, read in the DisposableVMs
for element in tree.findall("QubesDisposableVm"):
try:
kwargs = {}
attr_list = ("qid", "name",
"template_qid",
"label", "dispid")
for attribute in attr_list:
kwargs[attribute] = element.get(attribute)
kwargs["qid"] = int(kwargs["qid"])
kwargs["dispid"] = int(kwargs["dispid"])
kwargs["template_qid"] = int(kwargs["template_qid"])
template_vm = self[kwargs.pop("template_qid")]
if template_vm is None:
print >> sys.stderr, "ERROR: DisposableVM '{0}' uses unkown template qid='{1}'!".\
format(kwargs["name"], kwargs["template_qid"])
else:
kwargs["template_vm"] = template_vm
kwargs["netvm_vm"] = self.get_default_netvm_vm()
if kwargs["label"] is not None:
if kwargs["label"] not in QubesVmLabels:
print >> sys.stderr, "ERROR: incorrect label for VM '{0}'".format(kwargs["name"])
kwargs.pop ("label")
else:
kwargs["label"] = QubesVmLabels[kwargs["label"]]
vm = QubesDisposableVm(**kwargs)
self[vm.qid] = vm
except (ValueError, LookupError) as err:
print("{0}: import error (DisposableAppVm): {1}".format(
os.path.basename(sys.argv[0]), err))
return False
# if there was no clockvm entry in qubes.xml, try to determine default:
# root of default NetVM chain
if clockvm is None:
if self.default_netvm_qid is not None:
clockvm = self[self.default_netvm_qid]
# Find root of netvm chain
while clockvm.netvm_vm is not None:
clockvm = clockvm.netvm_vm
self.clockvm_qid = clockvm.qid
# Enable ntpd in ClockVM
if self.clockvm_qid is not None:
self[self.clockvm_qid].services['ntpd'] = True
return True
class QubesDaemonPidfile(object):
def __init__(self, name):
self.name = name
self.path = "/var/run/qubes/" + name + ".pid"
def create_pidfile(self):
f = open (self.path, 'w')
f.write(str(os.getpid()))
f.close()
def pidfile_exists(self):
return os.path.exists(self.path)
def read_pid(self):
f = open (self.path)
pid = f.read ().strip()
f.close()
return int(pid)
def pidfile_is_stale(self):
if not self.pidfile_exists():
return False
# check if the pid file is valid...
proc_path = "/proc/" + str(self.read_pid()) + "/cmdline"
if not os.path.exists (proc_path):
print >> sys.stderr, "Path {0} doesn't exist, assuming stale pidfile.".format(proc_path)
return True
f = open (proc_path)
cmdline = f.read ()
f.close()
# The following doesn't work with python -- one would have to get argv[1] and compare it with self.name...
# if not cmdline.strip().endswith(self.name):
# print >> sys.stderr, "{0} = {1} doesn't seem to point to our process ({2}), assuming stale pidile.".format(proc_path, cmdline, self.name)
# return True
return False # It's a good pidfile
def remove_pidfile(self):
os.remove (self.path)
def __enter__ (self):
# assumes the pidfile doesn't exist -- you should ensure it before opening the context
self.create_pidfile()
def __exit__ (self):
self.remove_pidfile()
# vim:sw=4:et: