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systemd/hwdb.d/parse_hwdb.py
Bastien Nocera 9e2dbfef47 hwdb: Allow end-users root-less access to USB analyzers 
Procotol analyzers are external devices used to capture traffic over a
wire so that it could be analysed. End-users at the console should be
able to access those devices without requiring root access.

This change obsoletes the need to install Total Phase's "Linux drivers",
which are really just udev rules and hotplug usermap files to do that:
https://www.totalphase.com/products/usb-drivers-linux/
2021-09-02 16:01:28 +02:00

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#!/usr/bin/env python3
# SPDX-License-Identifier: MIT
#
# This file is distributed under the MIT license, see below.
#
# The MIT License (MIT)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import glob
import string
import sys
import os
try:
from pyparsing import (Word, White, Literal, ParserElement, Regex, LineEnd,
OneOrMore, Combine, Or, Optional, Suppress, Group,
nums, alphanums, printables,
stringEnd, pythonStyleComment,
ParseBaseException, __diag__)
except ImportError:
print('pyparsing is not available')
sys.exit(77)
try:
from evdev.ecodes import ecodes
except ImportError:
ecodes = None
print('WARNING: evdev is not available')
try:
from functools import lru_cache
except ImportError:
# don't do caching on old python
lru_cache = lambda: (lambda f: f)
__diag__.warn_multiple_tokens_in_named_alternation = True
__diag__.warn_ungrouped_named_tokens_in_collection = True
__diag__.warn_name_set_on_empty_Forward = True
__diag__.warn_on_multiple_string_args_to_oneof = True
__diag__.enable_debug_on_named_expressions = True
EOL = LineEnd().suppress()
EMPTYLINE = LineEnd()
COMMENTLINE = pythonStyleComment + EOL
INTEGER = Word(nums)
REAL = Combine((INTEGER + Optional('.' + Optional(INTEGER))) ^ ('.' + INTEGER))
SIGNED_REAL = Combine(Optional(Word('-+')) + REAL)
UDEV_TAG = Word(string.ascii_uppercase, alphanums + '_')
# Those patterns are used in type-specific matches
TYPES = {'mouse': ('usb', 'bluetooth', 'ps2', '*'),
'evdev': ('name', 'atkbd', 'input'),
'fb': ('pci'),
'id-input': ('modalias'),
'touchpad': ('i8042', 'rmi', 'bluetooth', 'usb'),
'joystick': ('i8042', 'rmi', 'bluetooth', 'usb'),
'keyboard': ('name', ),
'sensor': ('modalias', ),
'ieee1394-unit-function' : ('node', ),
}
# Patterns that are used to set general properties on a device
GENERAL_MATCHES = {'acpi',
'bluetooth',
'usb',
'pci',
'sdio',
'vmbus',
'OUI',
'ieee1394',
}
def upperhex_word(length):
return Word(nums + 'ABCDEF', exact=length)
@lru_cache()
def hwdb_grammar():
ParserElement.setDefaultWhitespaceChars('')
prefix = Or(category + ':' + Or(conn) + ':'
for category, conn in TYPES.items())
matchline_typed = Combine(prefix + Word(printables + ' ' + '®'))
matchline_general = Combine(Or(GENERAL_MATCHES) + ':' + Word(printables + ' ' + '®'))
matchline = (matchline_typed | matchline_general) + EOL
propertyline = (White(' ', exact=1).suppress() +
Combine(UDEV_TAG - '=' - Optional(Word(alphanums + '_=:@*.!-;, "/'))
- Optional(pythonStyleComment)) +
EOL)
propertycomment = White(' ', exact=1) + pythonStyleComment + EOL
group = (OneOrMore(matchline('MATCHES*') ^ COMMENTLINE.suppress()) -
OneOrMore(propertyline('PROPERTIES*') ^ propertycomment.suppress()) -
(EMPTYLINE ^ stringEnd()).suppress())
commentgroup = OneOrMore(COMMENTLINE).suppress() - EMPTYLINE.suppress()
grammar = OneOrMore(Group(group)('GROUPS*') ^ commentgroup) + stringEnd()
return grammar
@lru_cache()
def property_grammar():
ParserElement.setDefaultWhitespaceChars(' ')
dpi_setting = Group(Optional('*')('DEFAULT') + INTEGER('DPI') + Suppress('@') + INTEGER('HZ'))('SETTINGS*')
mount_matrix_row = SIGNED_REAL + ',' + SIGNED_REAL + ',' + SIGNED_REAL
mount_matrix = Group(mount_matrix_row + ';' + mount_matrix_row + ';' + mount_matrix_row)('MOUNT_MATRIX')
xkb_setting = Optional(Word(alphanums + '+-/@._'))
# Although this set doesn't cover all of characters in database entries, it's enough for test targets.
name_literal = Word(printables + ' ')
props = (('MOUSE_DPI', Group(OneOrMore(dpi_setting))),
('MOUSE_WHEEL_CLICK_ANGLE', INTEGER),
('MOUSE_WHEEL_CLICK_ANGLE_HORIZONTAL', INTEGER),
('MOUSE_WHEEL_CLICK_COUNT', INTEGER),
('MOUSE_WHEEL_CLICK_COUNT_HORIZONTAL', INTEGER),
('ID_AUTOSUSPEND', Or((Literal('0'), Literal('1')))),
('ID_INPUT', Or((Literal('0'), Literal('1')))),
('ID_INPUT_ACCELEROMETER', Or((Literal('0'), Literal('1')))),
('ID_INPUT_JOYSTICK', Or((Literal('0'), Literal('1')))),
('ID_INPUT_KEY', Or((Literal('0'), Literal('1')))),
('ID_INPUT_KEYBOARD', Or((Literal('0'), Literal('1')))),
('ID_INPUT_MOUSE', Or((Literal('0'), Literal('1')))),
('ID_INPUT_POINTINGSTICK', Or((Literal('0'), Literal('1')))),
('ID_INPUT_SWITCH', Or((Literal('0'), Literal('1')))),
('ID_INPUT_TABLET', Or((Literal('0'), Literal('1')))),
('ID_INPUT_TABLET_PAD', Or((Literal('0'), Literal('1')))),
('ID_INPUT_TOUCHPAD', Or((Literal('0'), Literal('1')))),
('ID_INPUT_TOUCHSCREEN', Or((Literal('0'), Literal('1')))),
('ID_INPUT_TRACKBALL', Or((Literal('0'), Literal('1')))),
('ID_SIGNAL_ANALYZER', Or((Literal('0'), Literal('1')))),
('POINTINGSTICK_SENSITIVITY', INTEGER),
('POINTINGSTICK_CONST_ACCEL', REAL),
('ID_INPUT_JOYSTICK_INTEGRATION', Or(('internal', 'external'))),
('ID_INPUT_TOUCHPAD_INTEGRATION', Or(('internal', 'external'))),
('XKB_FIXED_LAYOUT', xkb_setting),
('XKB_FIXED_VARIANT', xkb_setting),
('XKB_FIXED_MODEL', xkb_setting),
('KEYBOARD_LED_NUMLOCK', Literal('0')),
('KEYBOARD_LED_CAPSLOCK', Literal('0')),
('ACCEL_MOUNT_MATRIX', mount_matrix),
('ACCEL_LOCATION', Or(('display', 'base'))),
('PROXIMITY_NEAR_LEVEL', INTEGER),
('IEEE1394_UNIT_FUNCTION_MIDI', Or((Literal('0'), Literal('1')))),
('IEEE1394_UNIT_FUNCTION_AUDIO', Or((Literal('0'), Literal('1')))),
('IEEE1394_UNIT_FUNCTION_VIDEO', Or((Literal('0'), Literal('1')))),
('ID_VENDOR_FROM_DATABASE', name_literal),
('ID_MODEL_FROM_DATABASE', name_literal),
('ID_TAG_MASTER_OF_SEAT', Literal('1')),
)
fixed_props = [Literal(name)('NAME') - Suppress('=') - val('VALUE')
for name, val in props]
kbd_props = [Regex(r'KEYBOARD_KEY_[0-9a-f]+')('NAME')
- Suppress('=') -
('!' ^ (Optional('!') - Word(alphanums + '_')))('VALUE')
]
abs_props = [Regex(r'EVDEV_ABS_[0-9a-f]{2}')('NAME')
- Suppress('=') -
Word(nums + ':')('VALUE')
]
grammar = Or(fixed_props + kbd_props + abs_props) + EOL
return grammar
ERROR = False
def error(fmt, *args, **kwargs):
global ERROR
ERROR = True
print(fmt.format(*args, **kwargs))
def convert_properties(group):
matches = [m[0] for m in group.MATCHES]
props = [p[0] for p in group.PROPERTIES]
return matches, props
def parse(fname):
grammar = hwdb_grammar()
try:
with open(fname, 'r', encoding='UTF-8') as f:
parsed = grammar.parseFile(f)
except ParseBaseException as e:
error('Cannot parse {}: {}', fname, e)
return []
return [convert_properties(g) for g in parsed.GROUPS]
def check_matches(groups):
matches = sum((group[0] for group in groups), [])
# This is a partial check. The other cases could be also done, but those
# two are most commonly wrong.
grammars = { 'usb' : 'v' + upperhex_word(4) + Optional('p' + upperhex_word(4)),
'pci' : 'v' + upperhex_word(8) + Optional('d' + upperhex_word(8)),
}
for match in matches:
prefix, rest = match.split(':', maxsplit=1)
gr = grammars.get(prefix)
if gr:
try:
gr.parseString(rest)
except ParseBaseException as e:
error('Pattern {!r} is invalid: {}', rest, e)
continue
if rest[-1] not in '*:':
error('pattern {} does not end with "*" or ":"', match)
matches.sort()
prev = None
for match in matches:
if match == prev:
error('Match {!r} is duplicated', match)
prev = match
def check_one_default(prop, settings):
defaults = [s for s in settings if s.DEFAULT]
if len(defaults) > 1:
error('More than one star entry: {!r}', prop)
def check_one_mount_matrix(prop, value):
numbers = [s for s in value if s not in {';', ','}]
if len(numbers) != 9:
error('Wrong accel matrix: {!r}', prop)
try:
numbers = [abs(float(number)) for number in numbers]
except ValueError:
error('Wrong accel matrix: {!r}', prop)
bad_x, bad_y, bad_z = max(numbers[0:3]) == 0, max(numbers[3:6]) == 0, max(numbers[6:9]) == 0
if bad_x or bad_y or bad_z:
error('Mount matrix is all zero in {} row: {!r}',
'x' if bad_x else ('y' if bad_y else 'z'),
prop)
def check_one_keycode(prop, value):
if value != '!' and ecodes is not None:
key = 'KEY_' + value.upper()
if not (key in ecodes or
value.upper() in ecodes or
# new keys added in kernel 5.5
'KBD_LCD_MENU' in key):
error('Keycode {} unknown', key)
def check_wheel_clicks(properties):
pairs = (('MOUSE_WHEEL_CLICK_COUNT_HORIZONTAL', 'MOUSE_WHEEL_CLICK_COUNT'),
('MOUSE_WHEEL_CLICK_ANGLE_HORIZONTAL', 'MOUSE_WHEEL_CLICK_ANGLE'),
('MOUSE_WHEEL_CLICK_COUNT_HORIZONTAL', 'MOUSE_WHEEL_CLICK_ANGLE_HORIZONTAL'),
('MOUSE_WHEEL_CLICK_COUNT', 'MOUSE_WHEEL_CLICK_ANGLE'))
for pair in pairs:
if pair[0] in properties and pair[1] not in properties:
error('{} requires {} to be specified', *pair)
def check_properties(groups):
grammar = property_grammar()
for matches, props in groups:
seen_props = {}
for prop in props:
# print('--', prop)
prop = prop.partition('#')[0].rstrip()
try:
parsed = grammar.parseString(prop)
except ParseBaseException as e:
error('Failed to parse: {!r}', prop)
continue
# print('{!r}'.format(parsed))
if parsed.NAME in seen_props:
error('Property {} is duplicated', parsed.NAME)
seen_props[parsed.NAME] = parsed.VALUE
if parsed.NAME == 'MOUSE_DPI':
check_one_default(prop, parsed.VALUE.SETTINGS)
elif parsed.NAME == 'ACCEL_MOUNT_MATRIX':
check_one_mount_matrix(prop, parsed.VALUE)
elif parsed.NAME.startswith('KEYBOARD_KEY_'):
val = parsed.VALUE if isinstance(parsed.VALUE, str) else parsed.VALUE[0]
check_one_keycode(prop, val)
check_wheel_clicks(seen_props)
def print_summary(fname, groups):
n_matches = sum(len(matches) for matches, props in groups)
n_props = sum(len(props) for matches, props in groups)
print('{}: {} match groups, {} matches, {} properties'
.format(fname, len(groups), n_matches, n_props))
if n_matches == 0 or n_props == 0:
error('{}: no matches or props'.format(fname))
if __name__ == '__main__':
args = sys.argv[1:] or sorted(glob.glob(os.path.dirname(sys.argv[0]) + '/[678][0-9]-*.hwdb'))
for fname in args:
groups = parse(fname)
print_summary(fname, groups)
check_matches(groups)
check_properties(groups)
sys.exit(ERROR)
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