#!/usr/bin/python # -*- coding: utf-8 -*- # # The Qubes OS Project, http://www.qubes-os.org # # Copyright (C) 2011 Marek Marczykowski # Copyright (C) 2014 Wojciech Porczyk # # 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 __future__ import absolute_import import string from lxml import etree from lxml.etree import ElementTree, SubElement, Element from qubes.qubes import QubesException from qubes.qubes import vmm from qubes.qubes import system_path,vm_files import sys import os import subprocess import re import time import stat import libvirt from qubes.qdb import QubesDB,Error,DisconnectedError import xen.lowlevel.xc import xen.lowlevel.xs BLKSIZE = 512 # all frontends, prefer xvdi # TODO: get this from libvirt driver? AVAILABLE_FRONTENDS = ['xvd'+c for c in string.lowercase[8:]+string.lowercase[:8]] def mbytes_to_kmg(size): if size > 1024: return "%d GiB" % (size/1024) else: return "%d MiB" % size def kbytes_to_kmg(size): if size > 1024: return mbytes_to_kmg(size/1024) else: return "%d KiB" % size def bytes_to_kmg(size): if size > 1024: return kbytes_to_kmg(size/1024) else: return "%d B" % size def size_to_human (size): """Humane readable size, with 1/10 precission""" if size < 1024: return str (size); elif size < 1024*1024: return str(round(size/1024.0,1)) + ' KiB' elif size < 1024*1024*1024: return str(round(size/(1024.0*1024),1)) + ' MiB' else: return str(round(size/(1024.0*1024*1024),1)) + ' GiB' def parse_size(size): units = [ ('K', 1024), ('KB', 1024), ('M', 1024*1024), ('MB', 1024*1024), ('G', 1024*1024*1024), ('GB', 1024*1024*1024), ] size = size.strip().upper() if size.isdigit(): return int(size) for unit, multiplier in units: if size.endswith(unit): size = size[:-len(unit)].strip() return int(size)*multiplier raise QubesException("Invalid size: {0}.".format(size)) def get_disk_usage_one(st): try: return st.st_blocks * BLKSIZE except AttributeError: return st.st_size def get_disk_usage(path): try: st = os.lstat(path) except OSError: return 0 ret = get_disk_usage_one(st) # if path is not a directory, this is skipped for dirpath, dirnames, filenames in os.walk(path): for name in dirnames + filenames: ret += get_disk_usage_one(os.lstat(os.path.join(dirpath, name))) return ret def print_stdout(text): print (text) def print_stderr(text): print >> sys.stderr, (text) ###### Block devices ######## def block_devid_to_name(devid): major = devid / 256 minor = devid % 256 dev_class = "" if major == 202: dev_class = "xvd" elif major == 8: dev_class = "sd" else: raise QubesException("Unknown device class %d" % major) if minor % 16 == 0: return "%s%c" % (dev_class, ord('a')+minor/16) else: return "%s%c%d" % (dev_class, ord('a')+minor/16, minor%16) def block_name_to_majorminor(name): # check if it is already devid if isinstance(name, int): return (name / 256, name % 256) if name.isdigit(): return (int(name) / 256, int(name) % 256) if os.path.exists('/dev/%s' % name): blk_info = os.stat(os.path.realpath('/dev/%s' % name)) if stat.S_ISBLK(blk_info.st_mode): return (blk_info.st_rdev / 256, blk_info.st_rdev % 256) major = 0 minor = 0 dXpY_style = False disk = True if name.startswith("xvd"): major = 202 elif name.startswith("sd"): major = 8 elif name.startswith("mmcblk"): dXpY_style = True major = 179 elif name.startswith("scd"): disk = False major = 11 elif name.startswith("sr"): disk = False major = 11 elif name.startswith("loop"): dXpY_style = True disk = False major = 7 elif name.startswith("md"): dXpY_style = True major = 9 elif name.startswith("dm-"): disk = False major = 253 else: # Unknown device return (0, 0) if not dXpY_style: name_match = re.match(r"^([a-z]+)([a-z-])([0-9]*)$", name) else: name_match = re.match(r"^([a-z]+)([0-9]*)(?:p([0-9]+))?$", name) if not name_match: raise QubesException("Invalid device name: %s" % name) if disk: if dXpY_style: minor = int(name_match.group(2))*8 else: minor = (ord(name_match.group(2))-ord('a')) * 16 else: minor = 0 if name_match.group(3): minor += int(name_match.group(3)) return (major, minor) def block_name_to_devid(name): # check if it is already devid if isinstance(name, int): return name if name.isdigit(): return int(name) (major, minor) = block_name_to_majorminor(name) return major << 8 | minor def block_find_unused_frontend(vm = None): assert vm is not None assert vm.is_running() xml = vm.libvirt_domain.XMLDesc() parsed_xml = etree.fromstring(xml) used = [target.get('dev', None) for target in parsed_xml.xpath("//domain/devices/disk/target")] for dev in AVAILABLE_FRONTENDS: if dev not in used: return dev return None def block_list_vm(vm, system_disks = False): name_re = re.compile(r"^[a-z0-9-]{1,12}$") device_re = re.compile(r"^[a-z0-9/-]{1,64}$") # FIXME: any better idea of desc_re? desc_re = re.compile(r"^.{1,255}$") mode_re = re.compile(r"^[rw]$") assert vm is not None if not vm.is_running(): return [] devices_list = {} try: untrusted_devices = vm.qdb.multiread('/qubes-block-devices/') except Error: vm.refresh() return {} def get_dev_item(dev, item): return untrusted_devices.get( '/qubes-block-devices/%s/%s' % (dev, item), None) untrusted_devices_names = list(set(map(lambda x: x.split("/")[2], untrusted_devices.keys()))) for untrusted_dev_name in untrusted_devices_names: if name_re.match(untrusted_dev_name): dev_name = untrusted_dev_name untrusted_device_size = get_dev_item(dev_name, 'size') untrusted_device_desc = get_dev_item(dev_name, 'desc') untrusted_device_mode = get_dev_item(dev_name, 'mode') untrusted_device_device = get_dev_item(dev_name, 'device') if untrusted_device_desc is None or untrusted_device_mode is None\ or untrusted_device_size is None: print >>sys.stderr, "Missing field in %s device parameters" %\ dev_name continue if untrusted_device_device is None: untrusted_device_device = '/dev/' + dev_name if not device_re.match(untrusted_device_device): print >> sys.stderr, "Invalid %s device path in VM '%s'" % ( dev_name, vm.name) continue device_device = untrusted_device_device if not untrusted_device_size.isdigit(): print >> sys.stderr, "Invalid %s device size in VM '%s'" % ( dev_name, vm.name) continue device_size = int(untrusted_device_size) if not desc_re.match(untrusted_device_desc): print >> sys.stderr, "Invalid %s device desc in VM '%s'" % ( dev_name, vm.name) continue device_desc = untrusted_device_desc if not mode_re.match(untrusted_device_mode): print >> sys.stderr, "Invalid %s device mode in VM '%s'" % ( dev_name, vm.name) continue device_mode = untrusted_device_mode if not system_disks: if vm.qid == 0 and device_desc.startswith(system_path[ "qubes_base_dir"]): continue visible_name = "%s:%s" % (vm.name, dev_name) devices_list[visible_name] = { "name": visible_name, "vm": vm.name, "device": device_device, "size": device_size, "desc": device_desc, "mode": device_mode } return devices_list def block_list(qvmc = None, vm = None, system_disks = False): if vm is not None: if not vm.is_running(): return [] else: vm_list = [ vm ] else: if qvmc is None: raise QubesException("You must pass either qvm or vm argument") vm_list = qvmc.values() devices_list = {} for vm in vm_list: devices_list.update(block_list_vm(vm, system_disks)) return devices_list def block_check_attached(qvmc, device): """ @type qvmc: QubesVmCollection """ if qvmc is None: # TODO: ValueError raise QubesException("You need to pass qvmc argument") for vm in qvmc.values(): if vm.qid == 0: # Connecting devices to dom0 not supported continue if not vm.is_running(): continue try: libvirt_domain = vm.libvirt_domain if libvirt_domain: xml = libvirt_domain.XMLDesc() else: xml = None except libvirt.libvirtError: if vmm.libvirt_conn.virConnGetLastError()[0] == libvirt.VIR_ERR_NO_DOMAIN: xml = None else: raise if xml: parsed_xml = etree.fromstring(xml) disks = parsed_xml.xpath("//domain/devices/disk") for disk in disks: backend_name = 'dom0' if disk.find('backenddomain') is not None: backend_name = disk.find('backenddomain').get('name') source = disk.find('source') if disk.get('type') == 'file': path = source.get('file') elif disk.get('type') == 'block': path = source.get('dev') else: # TODO: logger print >>sys.stderr, "Unknown disk type '%s' attached to " \ "VM '%s'" % (source.get('type'), vm.name) continue if backend_name == device['vm'] and path == device['device']: return { "frontend": disk.find('target').get('dev'), "vm": vm} return None def device_attach_check(vm, backend_vm, device, frontend, mode): """ Checks all the parameters, dies on errors """ if not vm.is_running(): raise QubesException("VM %s not running" % vm.name) if not backend_vm.is_running(): raise QubesException("VM %s not running" % backend_vm.name) if device['mode'] == 'r' and mode == 'w': raise QubesException("Cannot attach read-only device in read-write " "mode") def block_attach(qvmc, vm, device, frontend=None, mode="w", auto_detach=False, wait=True): backend_vm = qvmc.get_vm_by_name(device['vm']) device_attach_check(vm, backend_vm, device, frontend, mode) if frontend is None: frontend = block_find_unused_frontend(vm) if frontend is None: raise QubesException("No unused frontend found") else: # Check if any device attached at this frontend xml = vm.libvirt_domain.XMLDesc() parsed_xml = etree.fromstring(xml) disks = parsed_xml.xpath("//domain/devices/disk/target[@dev='%s']" % frontend) if len(disks): raise QubesException("Frontend %s busy in VM %s, detach it first" % (frontend, vm.name)) # Check if this device is attached to some domain attached_vm = block_check_attached(qvmc, device) if attached_vm: if auto_detach: block_detach(attached_vm['vm'], attached_vm['frontend']) else: raise QubesException("Device %s from %s already connected to VM " "%s as %s" % (device['device'], backend_vm.name, attached_vm['vm'], attached_vm['frontend'])) disk = Element("disk") disk.set('type', 'block') disk.set('device', 'disk') SubElement(disk, 'driver').set('name', 'phy') SubElement(disk, 'source').set('dev', device['device']) SubElement(disk, 'target').set('dev', frontend) if backend_vm.qid != 0: SubElement(disk, 'backenddomain').set('name', device['vm']) vm.libvirt_domain.attachDevice(etree.tostring(disk, encoding='utf-8')) try: # trigger watches to update device status # FIXME: this should be removed once libvirt will report such # events itself vm.qdb.write('/qubes-block-devices', '') except Error: pass def block_detach(vm, frontend = "xvdi"): xml = vm.libvirt_domain.XMLDesc() parsed_xml = etree.fromstring(xml) attached = parsed_xml.xpath("//domain/devices/disk") for disk in attached: if frontend is not None and disk.find('target').get('dev') != frontend: # Not the device we are looking for continue if frontend is None: # ignore system disks if disk.find('domain') == None and \ disk.find('source').get('dev').startswith(system_path[ "qubes_base_dir"]): continue vm.libvirt_domain.detachDevice(etree.tostring(disk, encoding='utf-8')) try: # trigger watches to update device status # FIXME: this should be removed once libvirt will report such # events itself vm.qdb.write('/qubes-block-devices', '') except Error: pass def block_detach_all(vm): """ Detach all non-system devices""" block_detach(vm, None) ####### USB devices ###### usb_ver_re = re.compile(r"^(1|2)$") usb_device_re = re.compile(r"^[0-9]+-[0-9]+(_[0-9]+)?$") usb_port_re = re.compile(r"^$|^[0-9]+-[0-9]+(\.[0-9]+)?$") def usb_setup(backend_vm_xid, vm_xid, devid, usb_ver): """ Attach frontend to the backend. backend_vm_xid - id of the backend domain vm_xid - id of the frontend domain devid - id of the pvusb controller """ num_ports = 8 trans = vmm.xs.transaction_start() be_path = "/local/domain/%d/backend/vusb/%d/%d" % (backend_vm_xid, vm_xid, devid) fe_path = "/local/domain/%d/device/vusb/%d" % (vm_xid, devid) be_perm = [{'dom': backend_vm_xid}, {'dom': vm_xid, 'read': True} ] fe_perm = [{'dom': vm_xid}, {'dom': backend_vm_xid, 'read': True} ] # Create directories and set permissions vmm.xs.write(trans, be_path, "") vmm.xs.set_permissions(trans, be_path, be_perm) vmm.xs.write(trans, fe_path, "") vmm.xs.set_permissions(trans, fe_path, fe_perm) # Write backend information into the location that frontend looks for vmm.xs.write(trans, "%s/backend-id" % fe_path, str(backend_vm_xid)) vmm.xs.write(trans, "%s/backend" % fe_path, be_path) # Write frontend information into the location that backend looks for vmm.xs.write(trans, "%s/frontend-id" % be_path, str(vm_xid)) vmm.xs.write(trans, "%s/frontend" % be_path, fe_path) # Write USB Spec version field. vmm.xs.write(trans, "%s/usb-ver" % be_path, usb_ver) # Write virtual root hub field. vmm.xs.write(trans, "%s/num-ports" % be_path, str(num_ports)) for port in range(1, num_ports+1): # Set all port to disconnected state vmm.xs.write(trans, "%s/port/%d" % (be_path, port), "") # Set state to XenbusStateInitialising vmm.xs.write(trans, "%s/state" % fe_path, "1") vmm.xs.write(trans, "%s/state" % be_path, "1") vmm.xs.write(trans, "%s/online" % be_path, "1") vmm.xs.transaction_end(trans) def usb_decode_device_from_xs(xs_encoded_device): """ recover actual device name (xenstore doesn't allow dot in key names, so it was translated to underscore) """ return xs_encoded_device.replace('_', '.') def usb_encode_device_for_xs(device): """ encode actual device name (xenstore doesn't allow dot in key names, so translated it into underscore) """ return device.replace('.', '_') def usb_list(): """ Returns a dictionary of USB devices (for PVUSB backends running in all VM). The dictionary is keyed by 'name' (see below), each element is a dictionary itself: vm = name of the backend domain xid = xid of the backend domain device = - name = :- desc = description """ # FIXME: any better idea of desc_re? desc_re = re.compile(r"^.{1,255}$") devices_list = {} xs_trans = vmm.xs.transaction_start() vm_list = vmm.xs.ls(xs_trans, '/local/domain') for xid in vm_list: vm_name = vmm.xs.read(xs_trans, '/local/domain/%s/name' % xid) vm_devices = vmm.xs.ls(xs_trans, '/local/domain/%s/qubes-usb-devices' % xid) if vm_devices is None: continue # when listing devices in xenstore we get encoded names for xs_encoded_device in vm_devices: # Sanitize device id if not usb_device_re.match(xs_encoded_device): print >> sys.stderr, "Invalid device id in backend VM '%s'" % vm_name continue device = usb_decode_device_from_xs(xs_encoded_device) device_desc = vmm.xs.read(xs_trans, '/local/domain/%s/qubes-usb-devices/%s/desc' % (xid, xs_encoded_device)) if not desc_re.match(device_desc): print >> sys.stderr, "Invalid %s device desc in VM '%s'" % (device, vm_name) continue visible_name = "%s:%s" % (vm_name, device) # grab version usb_ver = vmm.xs.read(xs_trans, '/local/domain/%s/qubes-usb-devices/%s/usb-ver' % (xid, xs_encoded_device)) if usb_ver is None or not usb_ver_re.match(usb_ver): print >> sys.stderr, "Invalid %s device USB version in VM '%s'" % (device, vm_name) continue devices_list[visible_name] = {"name": visible_name, "xid":int(xid), "vm": vm_name, "device":device, "desc":device_desc, "usb_ver":usb_ver} vmm.xs.transaction_end(xs_trans) return devices_list def usb_check_attached(xs_trans, backend_vm, device): """ Checks if the given device in the given backend attached to any frontend. Parameters: backend_vm - xid of the backend domain device - device name in the backend domain Returns None or a dictionary: vm - the name of the frontend domain xid - xid of the frontend domain frontend - frontend device number FIXME devid - frontend port number FIXME """ # sample xs content: /local/domain/0/backend/vusb/4/0/port/1 = "7-5" attached_dev = None vms = vmm.xs.ls(xs_trans, '/local/domain/%d/backend/vusb' % backend_vm) if vms is None: return None for vm in vms: if not vm.isdigit(): print >> sys.stderr, "Invalid VM id" continue frontend_devs = vmm.xs.ls(xs_trans, '/local/domain/%d/backend/vusb/%s' % (backend_vm, vm)) if frontend_devs is None: continue for frontend_dev in frontend_devs: if not frontend_dev.isdigit(): print >> sys.stderr, "Invalid frontend in VM %s" % vm continue ports = vmm.xs.ls(xs_trans, '/local/domain/%d/backend/vusb/%s/%s/port' % (backend_vm, vm, frontend_dev)) if ports is None: continue for port in ports: # FIXME: refactor, see similar loop in usb_find_unused_frontend(), use usb_list() instead? if not port.isdigit(): print >> sys.stderr, "Invalid port in VM %s frontend %s" % (vm, frontend) continue dev = vmm.xs.read(xs_trans, '/local/domain/%d/backend/vusb/%s/%s/port/%s' % (backend_vm, vm, frontend_dev, port)) if dev == "": continue # Sanitize device id if not usb_port_re.match(dev): print >> sys.stderr, "Invalid device id in backend VM %d @ %s/%s/port/%s" % \ (backend_vm, vm, frontend_dev, port) continue if dev == device: frontend = "%s-%s" % (frontend_dev, port) #TODO vm_name = xl_ctx.domid_to_name(int(vm)) if vm_name is None: # FIXME: should we wipe references to frontends running on nonexistent VMs? continue attached_dev = {"xid":int(vm), "frontend": frontend, "devid": device, "vm": vm_name} break return attached_dev #def usb_check_frontend_busy(vm, front_dev, port): # devport = frontend.split("-") # if len(devport) != 2: # raise QubesException("Malformed frontend syntax, must be in device-port format") # # FIXME: # # return vmm.xs.read('', '/local/domain/%d/device/vusb/%d/state' % (vm.xid, frontend)) == '4' # return False def usb_find_unused_frontend(xs_trans, backend_vm_xid, vm_xid, usb_ver): """ Find an unused frontend/port to link the given backend with the given frontend. Creates new frontend if needed. Returns frontend specification in - format. """ # This variable holds an index of last frontend scanned by the loop below. # If nothing found, this value will be used to derive the index of a new frontend. last_frontend_dev = -1 frontend_devs = vmm.xs.ls(xs_trans, "/local/domain/%d/device/vusb" % vm_xid) if frontend_devs is not None: for frontend_dev in frontend_devs: if not frontend_dev.isdigit(): print >> sys.stderr, "Invalid frontend_dev in VM %d" % vm_xid continue frontend_dev = int(frontend_dev) fe_path = "/local/domain/%d/device/vusb/%d" % (vm_xid, frontend_dev) if vmm.xs.read(xs_trans, "%s/backend-id" % fe_path) == str(backend_vm_xid): if vmm.xs.read(xs_trans, '/local/domain/%d/backend/vusb/%d/%d/usb-ver' % (backend_vm_xid, vm_xid, frontend_dev)) != usb_ver: last_frontend_dev = frontend_dev continue # here: found an existing frontend already connected to right backend using an appropriate USB version ports = vmm.xs.ls(xs_trans, '/local/domain/%d/backend/vusb/%d/%d/port' % (backend_vm_xid, vm_xid, frontend_dev)) if ports is None: print >> sys.stderr, "No ports in VM %d frontend_dev %d?" % (vm_xid, frontend_dev) last_frontend_dev = frontend_dev continue for port in ports: # FIXME: refactor, see similar loop in usb_check_attached(), use usb_list() instead? if not port.isdigit(): print >> sys.stderr, "Invalid port in VM %d frontend_dev %d" % (vm_xid, frontend_dev) continue port = int(port) dev = vmm.xs.read(xs_trans, '/local/domain/%d/backend/vusb/%d/%s/port/%s' % (backend_vm_xid, vm_xid, frontend_dev, port)) # Sanitize device id if not usb_port_re.match(dev): print >> sys.stderr, "Invalid device id in backend VM %d @ %d/%d/port/%d" % \ (backend_vm_xid, vm_xid, frontend_dev, port) continue if dev == "": return '%d-%d' % (frontend_dev, port) last_frontend_dev = frontend_dev # create a new frontend_dev and link it to the backend frontend_dev = last_frontend_dev + 1 usb_setup(backend_vm_xid, vm_xid, frontend_dev, usb_ver) return '%d-%d' % (frontend_dev, 1) def usb_attach(vm, backend_vm, device, frontend=None, auto_detach=False, wait=True): device_attach_check(vm, backend_vm, device, frontend) xs_trans = vmm.xs.transaction_start() xs_encoded_device = usb_encode_device_for_xs(device) usb_ver = vmm.xs.read(xs_trans, '/local/domain/%s/qubes-usb-devices/%s/usb-ver' % (backend_vm.xid, xs_encoded_device)) if usb_ver is None or not usb_ver_re.match(usb_ver): vmm.xs.transaction_end(xs_trans) raise QubesException("Invalid %s device USB version in VM '%s'" % (device, backend_vm.name)) if frontend is None: frontend = usb_find_unused_frontend(xs_trans, backend_vm.xid, vm.xid, usb_ver) else: # Check if any device attached at this frontend #if usb_check_frontend_busy(vm, frontend): # raise QubesException("Frontend %s busy in VM %s, detach it first" % (frontend, vm.name)) vmm.xs.transaction_end(xs_trans) raise NotImplementedError("Explicit USB frontend specification is not implemented yet") # Check if this device is attached to some domain attached_vm = usb_check_attached(xs_trans, backend_vm.xid, device) vmm.xs.transaction_end(xs_trans) if attached_vm: if auto_detach: usb_detach(backend_vm, attached_vm) else: raise QubesException("Device %s from %s already connected to VM %s as %s" % (device, backend_vm.name, attached_vm['vm'], attached_vm['frontend'])) # Run helper script xl_cmd = [ '/usr/lib/qubes/xl-qvm-usb-attach.py', str(vm.xid), device, frontend, str(backend_vm.xid) ] subprocess.check_call(xl_cmd) def usb_detach(backend_vm, attachment): xl_cmd = [ '/usr/lib/qubes/xl-qvm-usb-detach.py', str(attachment['xid']), attachment['devid'], attachment['frontend'], str(backend_vm.xid) ] subprocess.check_call(xl_cmd) def usb_detach_all(vm): raise NotImplementedError("Detaching all devices from a given VM is not implemented yet") ####### QubesWatch ###### def only_in_first_list(l1, l2): ret=[] for i in l1: if not i in l2: ret.append(i) return ret class QubesWatch(object): def __init__(self): self._qdb = {} self._qdb_events = {} self.block_callback = None self.meminfo_callback = None self.domain_callback = None vmm.libvirt_conn.domainEventRegisterAny( None, libvirt.VIR_DOMAIN_EVENT_ID_LIFECYCLE, self._domain_list_changed, None) vmm.libvirt_conn.domainEventRegisterAny( None, libvirt.VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, self._device_removed, None) # TODO: device attach libvirt event for vm in vmm.libvirt_conn.listAllDomains(): try: if vm.isActive(): self._register_watches(vm) except libvirt.libvirtError: # this will happen if we loose a race with another tool, # which can just remove the domain if vmm.libvirt_conn.virConnGetLastError()[0] == libvirt.VIR_ERR_NO_DOMAIN: pass raise # and for dom0 self._register_watches(None) def _qdb_handler(self, watch, fd, events, domain_name): try: path = self._qdb[domain_name].read_watch() except DisconnectedError: libvirt.virEventRemoveHandle(watch) del(self._qdb_events[domain_name]) self._qdb[domain_name].close() del(self._qdb[domain_name]) return if path.startswith('/qubes-block-devices'): if self.block_callback is not None: self.block_callback(domain_name) def setup_block_watch(self, callback): self.block_callback = callback def setup_meminfo_watch(self, callback): raise NotImplementedError def setup_domain_watch(self, callback): self.domain_callback = callback def get_meminfo_key(self, xid): return '/local/domain/%s/memory/meminfo' % xid def _register_watches(self, libvirt_domain): if libvirt_domain: name = libvirt_domain.name() if name in self._qdb: return # open separate connection to Qubes DB: # 1. to not confuse pull() with responses to real commands sent from # other threads (like read, write etc) with watch events # 2. to not think whether QubesDB is thread-safe (it isn't) while libvirt_domain.isActive() and name not in self._qdb: try: self._qdb[name] = QubesDB(name) except Error as e: if e.args[0] != 2: raise time.sleep(0.5) if name not in self._qdb: # domain no longer active return else: name = "dom0" self._qdb[name] = QubesDB(name) self._qdb[name].watch('/qubes-block-devices') self._qdb_events[name] = libvirt.virEventAddHandle( self._qdb[name].watch_fd(), libvirt.VIR_EVENT_HANDLE_READABLE, self._qdb_handler, name) def _unregister_watches(self, libvirt_domain): name = libvirt_domain.name() if name in self._qdb_events: libvirt.virEventRemoveHandle(self._qdb_events[name]) del(self._qdb_events[name]) if name in self._qdb: self._qdb[name].close() del(self._qdb[name]) def _domain_list_changed(self, conn, domain, event, reason, param): if event == libvirt.VIR_DOMAIN_EVENT_STARTED: self._register_watches(domain) elif event == libvirt.VIR_DOMAIN_EVENT_STOPPED: self._unregister_watches(domain) else: # ignore other events for now return None if self.domain_callback: self.domain_callback(name=domain.name(), uuid=domain.UUID()) def _device_removed(self, conn, domain, device, param): if self.block_callback is not None: self.block_callback(domain.name()) def watch_loop(self): while True: libvirt.virEventRunDefaultImpl() ##### updates check ##### UPDATES_DOM0_DISABLE_FLAG='/var/lib/qubes/updates/disable-updates' def updates_vms_toggle(qvm_collection, value): for vm in qvm_collection.values(): if vm.qid == 0: continue if value: vm.services.pop('qubes-update-check', None) if vm.is_running(): try: vm.run("systemctl start qubes-update-check.timer", user="root") except: pass else: vm.services['qubes-update-check'] = False if vm.is_running(): try: vm.run("systemctl stop qubes-update-check.timer", user="root") except: pass def updates_dom0_toggle(qvm_collection, value): if value: if os.path.exists(UPDATES_DOM0_DISABLE_FLAG): os.unlink(UPDATES_DOM0_DISABLE_FLAG) else: open(UPDATES_DOM0_DISABLE_FLAG, "w").close() def updates_dom0_status(qvm_collection): return not os.path.exists(UPDATES_DOM0_DISABLE_FLAG) # vim:sw=4:et: