core: update qvm-block code for HAL API
Use QubesDB to get list of devices, call libvirt methods to attach/detach devices.
This commit is contained in:
Marek Marczykowski-Górecki
parent
b4e0833cb7
commit
d4ab70ae9d
@ -21,6 +21,9 @@
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#
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import string
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from lxml import etree
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from lxml.etree import ElementTree, SubElement, Element
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from qubes import QubesException
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from qubes import vmm
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@ -37,6 +40,11 @@ import xen.lowlevel.xs
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BLKSIZE = 512
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# all frontends, prefer xvdi
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# TODO: get this from libvirt driver?
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AVAILABLE_FRONTENDS = ['xvd'+c for c in
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string.lowercase[8:]+string.lowercase[:8]]
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def mbytes_to_kmg(size):
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if size > 1024:
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return "%d GiB" % (size/1024)
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@ -207,127 +215,144 @@ def block_find_unused_frontend(vm = None):
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assert vm is not None
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assert vm.is_running()
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vbd_list = vmm.xs.ls('', '/local/domain/%d/device/vbd' % vm.xid)
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# xvd* devices
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major = 202
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# prefer xvdi
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for minor in range(8*16,254,16)+range(0,8*16,16):
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if vbd_list is None or str(major << 8 | minor) not in vbd_list:
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return block_devid_to_name(major << 8 | minor)
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xml = vm.libvirt_domain.XMLDesc()
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parsed_xml = etree.fromstring(xml)
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used = [target.get('dev', None) for target in
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parsed_xml.xpath("//domain/devices/disk/target")]
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for dev in AVAILABLE_FRONTENDS:
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if dev not in used:
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return dev
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return None
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def block_list(vm = None, system_disks = False):
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device_re = re.compile(r"^[a-z0-9-]{1,12}$")
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def block_list_vm(vm, system_disks = False):
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name_re = re.compile(r"^[a-z0-9-]{1,12}$")
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device_re = re.compile(r"^[a-z0-9/-]{1,64}$")
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# FIXME: any better idea of desc_re?
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desc_re = re.compile(r"^.{1,255}$")
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mode_re = re.compile(r"^[rw]$")
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xs_trans = vmm.xs.transaction_start()
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assert vm is not None
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vm_list = []
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if vm is not None:
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if not vm.is_running():
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vmm.xs.transaction_end(xs_trans)
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return []
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else:
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vm_list = [ str(vm.xid) ]
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else:
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vm_list = vmm.xs.ls(xs_trans, '/local/domain')
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if not vm.is_running():
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return []
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devices_list = {}
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for xid in vm_list:
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vm_name = vmm.xs.read(xs_trans, '/local/domain/%s/name' % xid)
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vm_devices = vmm.xs.ls(xs_trans, '/local/domain/%s/qubes-block-devices' % xid)
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if vm_devices is None:
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continue
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for device in vm_devices:
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# Sanitize device name
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if not device_re.match(device):
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print >> sys.stderr, "Invalid device name in VM '%s'" % vm_name
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continue
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device_size = vmm.xs.read(xs_trans, '/local/domain/%s/qubes-block-devices/%s/size' % (xid, device))
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device_desc = vmm.xs.read(xs_trans, '/local/domain/%s/qubes-block-devices/%s/desc' % (xid, device))
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device_mode = vmm.xs.read(xs_trans, '/local/domain/%s/qubes-block-devices/%s/mode' % (xid, device))
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untrusted_devices = vm.qdb.multiread('/qubes-block-devices/')
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if device_size is None or device_desc is None or device_mode is None:
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print >> sys.stderr, "Missing field in %s device parameters" % device
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def get_dev_item(dev, item):
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return untrusted_devices.get(
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'/qubes-block-devices/%s/%s' % (dev, item),
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None)
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untrusted_devices_names = list(set(map(lambda x: x.split("/")[2],
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untrusted_devices.keys())))
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for untrusted_dev_name in untrusted_devices_names:
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if name_re.match(untrusted_dev_name):
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dev_name = untrusted_dev_name
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untrusted_device_size = get_dev_item(dev_name, 'size')
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untrusted_device_desc = get_dev_item(dev_name, 'desc')
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untrusted_device_mode = get_dev_item(dev_name, 'mode')
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untrusted_device_device = get_dev_item(dev_name, 'device')
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if untrusted_device_desc is None or untrusted_device_mode is None\
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or untrusted_device_size is None:
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print >>sys.stderr, "Missing field in %s device parameters" %\
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dev_name
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continue
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if not device_size.isdigit():
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print >> sys.stderr, "Invalid %s device size in VM '%s'" % (device, vm_name)
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if untrusted_device_device is None:
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untrusted_device_device = '/dev/' + dev_name
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if not device_re.match(untrusted_device_device):
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print >> sys.stderr, "Invalid %s device path in VM '%s'" % (
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dev_name, vm.name)
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continue
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if not desc_re.match(device_desc):
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print >> sys.stderr, "Invalid %s device desc in VM '%s'" % (device, vm_name)
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device_device = untrusted_device_device
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if not untrusted_device_size.isdigit():
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print >> sys.stderr, "Invalid %s device size in VM '%s'" % (
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dev_name, vm.name)
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continue
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if not mode_re.match(device_mode):
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print >> sys.stderr, "Invalid %s device mode in VM '%s'" % (device, vm_name)
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device_size = int(untrusted_device_size)
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if not desc_re.match(untrusted_device_desc):
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print >> sys.stderr, "Invalid %s device desc in VM '%s'" % (
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dev_name, vm.name)
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continue
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# Check if we know major number for this device; attach will work without this, but detach and check_attached don't
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if block_name_to_majorminor(device) == (0, 0):
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print >> sys.stderr, "Unsupported device %s:%s" % (vm_name, device)
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device_desc = untrusted_device_desc
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if not mode_re.match(untrusted_device_mode):
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print >> sys.stderr, "Invalid %s device mode in VM '%s'" % (
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dev_name, vm.name)
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continue
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device_mode = untrusted_device_mode
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if not system_disks:
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if xid == '0' and device_desc.startswith(system_path["qubes_base_dir"]):
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if vm.qid == 0 and device_desc.startswith(system_path[
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"qubes_base_dir"]):
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continue
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visible_name = "%s:%s" % (vm_name, device)
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devices_list[visible_name] = {"name": visible_name, "xid":int(xid),
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"vm": vm_name, "device":device, "size":int(device_size),
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"desc":device_desc, "mode":device_mode}
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visible_name = "%s:%s" % (vm.name, dev_name)
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devices_list[visible_name] = {
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"name": visible_name,
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"vm": vm.name,
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"device": device_device,
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"size": device_size,
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"desc": device_desc,
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"mode": device_mode
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}
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vmm.xs.transaction_end(xs_trans)
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return devices_list
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def block_check_attached(backend_vm, device, backend_xid = None):
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if backend_xid is None:
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backend_xid = backend_vm.xid
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xs_trans = vmm.xs.transaction_start()
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vm_list = vmm.xs.ls(xs_trans, '/local/domain/%d/backend/vbd' % backend_xid)
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if vm_list is None:
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vmm.xs.transaction_end(xs_trans)
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return None
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device_majorminor = None
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try:
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device_majorminor = block_name_to_majorminor(device)
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except:
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# Unknown devices will be compared directly - perhaps it is a filename?
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pass
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for vm_xid in vm_list:
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for devid in vmm.xs.ls(xs_trans, '/local/domain/%d/backend/vbd/%s' % (backend_xid, vm_xid)):
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(tmp_major, tmp_minor) = (0, 0)
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phys_device = vmm.xs.read(xs_trans, '/local/domain/%d/backend/vbd/%s/%s/physical-device' % (backend_xid, vm_xid, devid))
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dev_params = vmm.xs.read(xs_trans, '/local/domain/%d/backend/vbd/%s/%s/params' % (backend_xid, vm_xid, devid))
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if phys_device and phys_device.find(':'):
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(tmp_major, tmp_minor) = phys_device.split(":")
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tmp_major = int(tmp_major, 16)
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tmp_minor = int(tmp_minor, 16)
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else:
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# perhaps not ready yet - check params
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if not dev_params:
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# Skip not-phy devices
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continue
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elif not dev_params.startswith('/dev/'):
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# will compare params directly
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pass
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else:
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(tmp_major, tmp_minor) = block_name_to_majorminor(dev_params.lstrip('/dev/'))
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def block_list(qvmc = None, vm = None, system_disks = False):
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if vm is not None:
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if not vm.is_running():
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return []
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else:
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vm_list = [ vm ]
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else:
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if qvmc is None:
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raise QubesException("You must pass either qvm or vm argument")
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vm_list = qvmc.values()
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if (device_majorminor and (tmp_major, tmp_minor) == device_majorminor) or \
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(device_majorminor is None and dev_params == device):
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#TODO
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vm_name = xl_ctx.domid_to_name(int(vm_xid))
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frontend = block_devid_to_name(int(devid))
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vmm.xs.transaction_end(xs_trans)
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return {"xid":int(vm_xid), "frontend": frontend, "devid": int(devid), "vm": vm_name}
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vmm.xs.transaction_end(xs_trans)
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devices_list = {}
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for vm in vm_list:
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devices_list.update(block_list_vm(vm, system_disks))
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return devices_list
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def block_check_attached(qvmc, device):
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"""
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@type qvmc: QubesVmCollection
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"""
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if qvmc is None:
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# TODO: ValueError
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raise QubesException("You need to pass qvmc argument")
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for vm in qvmc.values():
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libvirt_domain = vm.libvirt_domain
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if libvirt_domain:
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xml = vm.libvirt_domain.XMLDesc()
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parsed_xml = etree.fromstring(xml)
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disks = parsed_xml.xpath("//domain/devices/disk")
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for disk in disks:
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backend_name = 'dom0'
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# FIXME: move <domain/> into <source/>
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if disk.find('domain') is not None:
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backend_name = disk.find('domain').get('name')
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source = disk.find('source')
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if disk.get('type') == 'file':
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path = source.get('file')
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elif disk.get('type') == 'block':
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path = source.get('dev')
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else:
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# TODO: logger
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print >>sys.stderr, "Unknown disk type '%s' attached to " \
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"VM '%s'" % (source.get('type'),
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vm.name)
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continue
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if backend_name == device['vm'] and path == device['device']:
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return {
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"frontend": disk.find('target').get('dev'),
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"vm": vm}
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return None
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def block_attach(vm, backend_vm, device, frontend=None, mode="w", auto_detach=False, wait=True):
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device_attach_check(vm, backend_vm, device, frontend)
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do_block_attach(vm, backend_vm, device, frontend, mode, auto_detach, wait)
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def device_attach_check(vm, backend_vm, device, frontend):
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def device_attach_check(vm, backend_vm, device, frontend, mode):
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""" Checks all the parameters, dies on errors """
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if not vm.is_running():
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raise QubesException("VM %s not running" % vm.name)
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@ -335,105 +360,67 @@ def device_attach_check(vm, backend_vm, device, frontend):
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if not backend_vm.is_running():
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raise QubesException("VM %s not running" % backend_vm.name)
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def do_block_attach(vm, backend_vm, device, frontend, mode, auto_detach, wait):
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if device['mode'] == 'r' and mode == 'w':
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raise QubesException("Cannot attach read-only device in read-write "
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"mode")
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def block_attach(qvmc, vm, device, frontend=None, mode="w", auto_detach=False, wait=True):
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backend_vm = qvmc.get_vm_by_name(device['vm'])
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device_attach_check(vm, backend_vm, device, frontend, mode)
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if frontend is None:
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frontend = block_find_unused_frontend(vm)
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if frontend is None:
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raise QubesException("No unused frontend found")
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else:
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# Check if any device attached at this frontend
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if vmm.xs.read('', '/local/domain/%d/device/vbd/%d/state' % (vm.xid, block_name_to_devid(frontend))) == '4':
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xml = vm.libvirt_domain.XMLDesc()
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parsed_xml = etree.fromstring(xml)
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disks = parsed_xml.xpath("//domain/devices/disk/target[@dev='%s']" %
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frontend)
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if len(disks):
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raise QubesException("Frontend %s busy in VM %s, detach it first" % (frontend, vm.name))
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# Check if this device is attached to some domain
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attached_vm = block_check_attached(backend_vm, device)
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attached_vm = block_check_attached(qvmc, device)
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if attached_vm:
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if auto_detach:
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block_detach(None, attached_vm['devid'], vm_xid=attached_vm['xid'])
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block_detach(attached_vm['vm'], attached_vm['frontend'])
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else:
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raise QubesException("Device %s from %s already connected to VM %s as %s" % (device, backend_vm.name, attached_vm['vm'], attached_vm['frontend']))
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raise QubesException("Device %s from %s already connected to VM "
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"%s as %s" % (device['device'],
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backend_vm.name, attached_vm['vm'], attached_vm['frontend']))
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if device.startswith('/'):
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backend_dev = 'script:file:' + device
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else:
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backend_dev = 'phy:/dev/' + device
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disk = Element("disk")
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disk.set('type', 'block')
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disk.set('device', 'disk')
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SubElement(disk, 'driver').set('name', 'phy')
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SubElement(disk, 'source').set('dev', device['device'])
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SubElement(disk, 'target').set('dev', frontend)
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if backend_vm.qid != 0:
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SubElement(disk, 'domain').set('name', device['vm'])
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vm.libvirt_domain.attachDevice(etree.tostring(disk, encoding='utf-8'))
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xl_cmd = [ '/usr/sbin/xl', 'block-attach', vm.name, backend_dev, frontend, mode, str(backend_vm.xid) ]
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subprocess.check_call(xl_cmd)
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if wait:
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be_path = '/local/domain/%d/backend/vbd/%d/%d' % (backend_vm.xid, vm.xid, block_name_to_devid(frontend))
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# There is no way to use xenstore watch with a timeout, so must check in a loop
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interval = 0.100
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# 5sec timeout
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timeout = 5/interval
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while timeout > 0:
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be_state = vmm.xs.read('', be_path + '/state')
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hotplug_state = vmm.xs.read('', be_path + '/hotplug-status')
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if be_state is None:
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raise QubesException("Backend device disappeared, something weird happened")
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elif int(be_state) == 4:
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# Ok
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return
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elif int(be_state) > 4:
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# Error
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error = vmm.xs.read('', '/local/domain/%d/error/backend/vbd/%d/%d/error' % (backend_vm.xid, vm.xid, block_name_to_devid(frontend)))
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if error is not None:
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raise QubesException("Error while connecting block device: " + error)
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else:
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raise QubesException("Unknown error while connecting block device")
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elif hotplug_state == 'error':
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hotplug_error = vmm.xs.read('', be_path + '/hotplug-error')
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if hotplug_error:
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raise QubesException("Error while connecting block device: " + hotplug_error)
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else:
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raise QubesException("Unknown hotplug error while connecting block device")
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time.sleep(interval)
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timeout -= interval
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raise QubesException("Timeout while waiting for block defice connection")
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def block_detach(vm, frontend = "xvdi"):
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def block_detach(vm, frontend = "xvdi", vm_xid = None):
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# Get XID if not provided already
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if vm_xid is None:
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if not vm.is_running():
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raise QubesException("VM %s not running" % vm.name)
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# FIXME: potential race
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vm_xid = vm.xid
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# Check if this device is really connected
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if not vmm.xs.read('', '/local/domain/%d/device/vbd/%d/state' % (vm_xid, block_name_to_devid(frontend))) == '4':
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# Do nothing - device already detached
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return
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xl_cmd = [ '/usr/sbin/xl', 'block-detach', str(vm_xid), str(frontend)]
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subprocess.check_call(xl_cmd)
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def block_detach_all(vm, vm_xid = None):
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""" Detach all non-system devices"""
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# Get XID if not provided already
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if vm_xid is None:
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if not vm.is_running():
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raise QubesException("VM %s not running" % vm.name)
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# FIXME: potential race
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vm_xid = vm.xid
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xs_trans = vmm.xs.transaction_start()
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devices = vmm.xs.ls(xs_trans, '/local/domain/%d/device/vbd' % vm_xid)
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if devices is None:
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return
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devices_to_detach = []
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for devid in devices:
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# check if this is system disk
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be_path = vmm.xs.read(xs_trans, '/local/domain/%d/device/vbd/%s/backend' % (vm_xid, devid))
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assert be_path is not None
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be_params = vmm.xs.read(xs_trans, be_path + '/params')
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if be_path.startswith('/local/domain/0/') and be_params is not None and be_params.startswith(system_path["qubes_base_dir"]):
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# system disk
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xml = vm.libvirt_domain.XMLDesc()
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parsed_xml = etree.fromstring(xml)
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attached = parsed_xml.xpath("//domain/devices/disk")
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||||
for disk in attached:
|
||||
if frontend is not None and disk.find('target').get('dev') != frontend:
|
||||
# Not the device we are looking for
|
||||
continue
|
||||
devices_to_detach.append(devid)
|
||||
vmm.xs.transaction_end(xs_trans)
|
||||
for devid in devices_to_detach:
|
||||
xl_cmd = [ '/usr/sbin/xl', 'block-detach', str(vm_xid), devid]
|
||||
subprocess.check_call(xl_cmd)
|
||||
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'))
|
||||
|
||||
def block_detach_all(vm):
|
||||
""" Detach all non-system devices"""
|
||||
|
||||
block_detach(vm, None)
|
||||
|
||||
####### USB devices ######
|
||||
|
||||
|
||||
@ -70,14 +70,13 @@ def main():
|
||||
print >> sys.stderr, "Only one of -l -a/-A -d is allowed!"
|
||||
exit (1)
|
||||
|
||||
if options.do_attach or options.do_detach:
|
||||
qvm_collection = QubesVmCollection()
|
||||
qvm_collection.lock_db_for_reading()
|
||||
qvm_collection.load()
|
||||
qvm_collection.unlock_db()
|
||||
qvm_collection = QubesVmCollection()
|
||||
qvm_collection.lock_db_for_reading()
|
||||
qvm_collection.load()
|
||||
qvm_collection.unlock_db()
|
||||
|
||||
if options.do_attach:
|
||||
if (len (args) != 2):
|
||||
if len(args) != 2:
|
||||
parser.error ("You must provide vm name and device!")
|
||||
vm = qvm_collection.get_vm_by_name(args[0])
|
||||
if vm is None:
|
||||
@ -90,12 +89,10 @@ def main():
|
||||
(dev['vm'], dev['device']) = args[1].split(":")
|
||||
dev['mode'] = 'w'
|
||||
else:
|
||||
dev_list = block_list()
|
||||
dev_list = block_list(qvm_collection)
|
||||
if not args[1] in dev_list.keys():
|
||||
parser.error ("Invalid device name: %s" % args[1])
|
||||
dev = dev_list[args[1]]
|
||||
backend_vm = qvm_collection.get_vm_by_name(dev['vm'])
|
||||
assert backend_vm is not None
|
||||
kwargs = {}
|
||||
if options.frontend:
|
||||
kwargs['frontend'] = options.frontend
|
||||
@ -105,7 +102,7 @@ def main():
|
||||
kwargs['mode'] = dev['mode']
|
||||
kwargs['auto_detach'] = options.auto_detach
|
||||
try:
|
||||
block_attach(vm, backend_vm, dev['device'], **kwargs)
|
||||
block_attach(qvm_collection, vm, dev, **kwargs)
|
||||
except QubesException as e:
|
||||
print >> sys.stderr, "ERROR: %s" % str(e)
|
||||
sys.exit(1)
|
||||
@ -125,26 +122,28 @@ def main():
|
||||
block_detach_all(vm)
|
||||
else:
|
||||
# Maybe device?
|
||||
dev_list = block_list()
|
||||
dev_list = block_list(qvm_collection)
|
||||
if not args[0] in dev_list.keys():
|
||||
parser.error ("Invalid VM or device name: %s" % args[0])
|
||||
dev = dev_list[args[0]]
|
||||
attached_to = block_check_attached(None, dev['device'], backend_xid = dev['xid'])
|
||||
attached_to = block_check_attached(qvm_collection, dev)
|
||||
if attached_to is None:
|
||||
print >> sys.stderr, "WARNING: Device not connected to any VM"
|
||||
exit(0)
|
||||
block_detach(None, attached_to['devid'], vm_xid=attached_to['xid'])
|
||||
block_detach(attached_to['vm'], attached_to['frontend'])
|
||||
else:
|
||||
# do_list
|
||||
if len(args) > 0:
|
||||
parser.error ("Too many parameters")
|
||||
kwargs = {}
|
||||
kwargs['qvmc'] = qvm_collection
|
||||
kwargs['system_disks'] = options.system_disks
|
||||
for dev in block_list(**kwargs).values():
|
||||
attached_to = block_check_attached(None, dev['device'], backend_xid = dev['xid'])
|
||||
attached_to = block_check_attached(qvm_collection, dev)
|
||||
attached_to_str = ""
|
||||
if attached_to:
|
||||
attached_to_str = " (attached to '%s' as '%s')" % (attached_to['vm'], attached_to['frontend'])
|
||||
attached_to_str = " (attached to '%s' as '%s')" % (
|
||||
attached_to['vm'].name, attached_to['frontend'])
|
||||
size_str = bytes_to_kmg(dev['size'])
|
||||
print "%s\t%s %s%s" % (dev['name'], dev['desc'], size_str, attached_to_str)
|
||||
exit (0)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user