293 lines
10 KiB
Python
293 lines
10 KiB
Python
# -*- encoding: utf8 -*-
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#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2015-2016 Wojtek Porczyk <woju@invisiblethingslab.com>
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# Copyright (C) 2016 Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
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# Copyright (C) 2017 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with this program; if not, see <http://www.gnu.org/licenses/>.
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'''API for various types of devices.
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Main concept is that some domain main
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expose (potentially multiple) devices, which can be attached to other domains.
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Devices can be of different classes (like 'pci', 'usb', etc). Each device
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class is implemented by an extension.
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Devices are identified by pair of (backend domain, `ident`), where `ident` is
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:py:class:`str`.
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'''
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class DeviceAssignment(object): # pylint: disable=too-few-public-methods
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''' Maps a device to a frontend_domain. '''
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def __init__(self, backend_domain, ident, options=None,
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persistent=False, frontend_domain=None, devclass=None):
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self.backend_domain = backend_domain
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self.ident = ident
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self.devclass = devclass
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self.options = options or {}
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self.persistent = persistent
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self.frontend_domain = frontend_domain
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def __repr__(self):
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return "[%s]:%s" % (self.backend_domain, self.ident)
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def __hash__(self):
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return hash((self.backend_domain, self.ident))
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def __eq__(self, other):
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if not isinstance(self, other.__class__):
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return NotImplemented
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return self.backend_domain == other.backend_domain \
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and self.ident == other.ident
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def clone(self):
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'''Clone object instance'''
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return self.__class__(
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self.backend_domain,
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self.ident,
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self.options,
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self.persistent,
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self.frontend_domain,
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self.devclass,
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)
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@property
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def device(self):
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'''Get DeviceInfo object corresponding to this DeviceAssignment'''
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return self.backend_domain.devices[self.devclass][self.ident]
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class DeviceInfo(object):
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''' Holds all information about a device '''
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# pylint: disable=too-few-public-methods
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def __init__(self, backend_domain, devclass, ident, description=None,
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**kwargs):
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#: domain providing this device
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self.backend_domain = backend_domain
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#: device class
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self.devclass = devclass
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#: device identifier (unique for given domain and device type)
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self.ident = ident
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#: human readable description/name of the device
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self.description = description
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self.data = kwargs
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def __hash__(self):
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return hash((str(self.backend_domain), self.ident))
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def __eq__(self, other):
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try:
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return (
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self.backend_domain == other.backend_domain and
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self.ident == other.ident
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)
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except AttributeError:
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return False
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def __str__(self):
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return '{!s}:{!s}'.format(self.backend_domain, self.ident)
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class UnknownDevice(DeviceInfo):
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# pylint: disable=too-few-public-methods
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'''Unknown device - for example exposed by domain not running currently'''
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def __init__(self, backend_domain, devclass, ident, description=None,
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**kwargs):
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if description is None:
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description = "Unknown device"
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super(UnknownDevice, self).__init__(backend_domain, devclass, ident,
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description, **kwargs)
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class DeviceCollection(object):
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'''Bag for devices.
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Used as default value for :py:meth:`DeviceManager.__missing__` factory.
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:param vm: VM for which we manage devices
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:param class_: device class
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'''
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def __init__(self, vm, class_):
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self._vm = vm
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self._class = class_
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self._dev_cache = {}
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def attach(self, device_assignment):
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'''Attach (add) device to domain.
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:param DeviceAssignment device_assignment: device object
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'''
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if not device_assignment.frontend_domain:
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device_assignment.frontend_domain = self._vm
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else:
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assert device_assignment.frontend_domain == self._vm, \
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"Trying to attach DeviceAssignment belonging to other domain"
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if device_assignment.devclass is None:
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device_assignment.devclass = self._class
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else:
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assert device_assignment.devclass == self._class
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options = device_assignment.options.copy()
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if device_assignment.persistent:
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options['persistent'] = 'True'
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options_str = ' '.join('{}={}'.format(opt,
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val) for opt, val in sorted(options.items()))
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self._vm.qubesd_call(None,
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'admin.vm.device.{}.Attach'.format(self._class),
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'{!s}+{!s}'.format(device_assignment.backend_domain,
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device_assignment.ident),
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options_str.encode('utf-8'))
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def detach(self, device_assignment):
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'''Detach (remove) device from domain.
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:param DeviceAssignment device_assignment: device to detach
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(obtained from :py:meth:`assignments`)
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'''
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if not device_assignment.frontend_domain:
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device_assignment.frontend_domain = self._vm
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else:
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assert device_assignment.frontend_domain == self._vm, \
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"Trying to detach DeviceAssignment belonging to other domain"
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if device_assignment.devclass is None:
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device_assignment.devclass = self._class
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else:
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assert device_assignment.devclass == self._class
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self._vm.qubesd_call(None,
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'admin.vm.device.{}.Detach'.format(self._class),
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'{!s}+{!s}'.format(device_assignment.backend_domain,
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device_assignment.ident))
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def assignments(self, persistent=None):
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'''List assignments for devices which are (or may be) attached to the
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vm.
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Devices may be attached persistently (so they are included in
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:file:`qubes.xml`) or not. Device can also be in :file:`qubes.xml`,
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but be temporarily detached.
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:param bool persistent: only include devices which are or are not
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attached persistently.
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'''
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assignments_str = self._vm.qubesd_call(None,
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'admin.vm.device.{}.List'.format(self._class)).decode()
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for assignment_str in assignments_str.splitlines():
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device, _, options_all = assignment_str.partition(' ')
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backend_domain, ident = device.split('+', 1)
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options = dict(opt_single.split('=', 1)
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for opt_single in options_all.split(' ') if opt_single)
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dev_persistent = (options.pop('persistent', False) in
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['True', 'yes', True])
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if persistent is not None and dev_persistent != persistent:
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continue
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backend_domain = self._vm.app.domains[backend_domain]
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yield DeviceAssignment(backend_domain, ident, options,
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persistent=dev_persistent, frontend_domain=self._vm,
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devclass=self._class)
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def attached(self):
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'''List devices which are (or may be) attached to this vm '''
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for assignment in self.assignments():
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yield assignment.device
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def persistent(self):
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''' Devices persistently attached and safe to access before libvirt
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bootstrap.
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'''
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for assignment in self.assignments(True):
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yield assignment.device
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def available(self):
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'''List devices exposed by this vm'''
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devices_str = self._vm.qubesd_call(None,
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'admin.vm.device.{}.Available'.format(self._class)).decode()
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for dev_str in devices_str.splitlines():
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ident, _, info = dev_str.partition(' ')
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# description is special that it can contain spaces
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info, _, description = info.partition('description=')
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info_dict = dict(info_single.split('=', 1)
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for info_single in info.split(' ') if info_single)
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yield DeviceInfo(self._vm, self._class, ident,
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description=description,
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**info_dict)
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def update_persistent(self, device, persistent):
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'''Update `persistent` flag of already attached device.
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:param DeviceInfo device: device for which change persistent flag
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:param bool persistent: new persistent flag
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'''
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self._vm.qubesd_call(None,
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'admin.vm.device.{}.Set.persistent'.format(self._class),
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'{!s}+{!s}'.format(device.backend_domain,
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device.ident),
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str(persistent).encode('utf-8'))
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__iter__ = available
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def clear_cache(self):
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'''Clear cache of available devices'''
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self._dev_cache.clear()
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def __getitem__(self, item):
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'''Get device object with given ident.
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:returns: py:class:`DeviceInfo`
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If domain isn't running, it is impossible to check device validity,
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so return UnknownDevice object. Also do the same for non-existing
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devices - otherwise it will be impossible to detach already
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disconnected device.
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'''
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# fist, check if we have cached device info
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if item in self._dev_cache:
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return self._dev_cache[item]
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# then look for available devices
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for dev in self.available():
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if dev.ident == item:
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self._dev_cache[item] = dev
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return dev
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# if still nothing, return UnknownDevice instance for the reason
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# explained in docstring, but don't cache it
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return UnknownDevice(self._vm, self._class, item)
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class DeviceManager(dict):
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'''Device manager that hold all devices by their classess.
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:param vm: VM for which we manage devices
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'''
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def __init__(self, vm):
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super(DeviceManager, self).__init__()
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self._vm = vm
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def __missing__(self, key):
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self[key] = DeviceCollection(self._vm, key)
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return self[key]
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