|
|
@ -33,13 +33,14 @@ Module for nftables set management. |
|
|
|
|
|
|
|
import logging |
|
|
|
import subprocess |
|
|
|
import re |
|
|
|
|
|
|
|
import netaddr # MAC, IPv4, IPv6 |
|
|
|
import requests |
|
|
|
|
|
|
|
from collections import Iterable |
|
|
|
|
|
|
|
from config import Config |
|
|
|
from configparser import ConfigParser |
|
|
|
|
|
|
|
|
|
|
|
class ExecError(Exception): |
|
|
@ -95,13 +96,14 @@ class Parser: |
|
|
|
ip: can either be a tuple (in this case returns an IPRange), a |
|
|
|
single IP address or a IP Network. |
|
|
|
""" |
|
|
|
if isinstance(ip, tuple): |
|
|
|
begin, end = ip |
|
|
|
return netaddr.IPRange(begin, end, version=4) |
|
|
|
try: |
|
|
|
return netaddr.IPAddress(ip, version=4) |
|
|
|
except ValueError: |
|
|
|
return netaddr.IPNetwork(ip, version=4) |
|
|
|
except netaddr.core.AddrFormatError: |
|
|
|
try: |
|
|
|
return netaddr.IPNetwork(ip, version=4) |
|
|
|
except netaddr.core.AddrFormatError: |
|
|
|
begin, end = ip.split('-') |
|
|
|
return netaddr.IPRange(begin, end) |
|
|
|
@staticmethod |
|
|
|
def IPv6(ip): |
|
|
|
"""Check a IPv6 validity. |
|
|
@ -127,9 +129,15 @@ class Parser: |
|
|
|
@staticmethod |
|
|
|
def port_number(port): |
|
|
|
"""Check a port validity.""" |
|
|
|
port_number = int(port) |
|
|
|
if 0 <= port_number < 65536: |
|
|
|
return port_number |
|
|
|
try: |
|
|
|
port_number = int(port) |
|
|
|
if 0 <= port_number < 65536: |
|
|
|
return port_number |
|
|
|
except ValueError: |
|
|
|
begin, end = port.split('-') |
|
|
|
begin, end = int(begin), int(end) |
|
|
|
if 0 <= begin < end <= 65536: |
|
|
|
return port |
|
|
|
raise ValueError('Invalid port number: "{}".'.format(port)) |
|
|
|
|
|
|
|
class NetfilterSet: |
|
|
@ -145,6 +153,8 @@ class NetfilterSet: |
|
|
|
|
|
|
|
FLAGS = {'constant', 'interval', 'timeout'} |
|
|
|
|
|
|
|
NFT_TYPE = {'set', 'map'} |
|
|
|
|
|
|
|
def __init__(self, |
|
|
|
name, |
|
|
|
type_, # e.g.: ('MAC', 'IPv4') |
|
|
@ -152,21 +162,30 @@ class NetfilterSet: |
|
|
|
use_sudo=True, |
|
|
|
address_family='inet', # Manage both IPv4 and IPv6. |
|
|
|
table_name='filter', |
|
|
|
flags = [] |
|
|
|
flags = [], |
|
|
|
type_from=None |
|
|
|
): |
|
|
|
self.name = name |
|
|
|
self.content = set() |
|
|
|
# self.type |
|
|
|
self.set_type(type_) |
|
|
|
if type_from: |
|
|
|
self.set_type_from(type_from) |
|
|
|
self.nft_type = 'map' |
|
|
|
self.key_filters = tuple(self.FILTERS[i] for i in self.type_from) |
|
|
|
else: |
|
|
|
self.nft_type = 'set' |
|
|
|
self.filters = tuple(self.FILTERS[i] for i in self.type) |
|
|
|
self.set_flags(flags) |
|
|
|
# self.address_family |
|
|
|
self.set_address_family(address_family) |
|
|
|
self.table = table_name |
|
|
|
self.set_flags(flags) |
|
|
|
sudo = ["/usr/bin/sudo"] * int(bool(use_sudo)) |
|
|
|
self.nft = [*sudo, "/usr/sbin/nft"] |
|
|
|
if target_content: |
|
|
|
if target_content and self.nft_type == 'set': |
|
|
|
self._target_content = self.validate_set_data(target_content) |
|
|
|
elif target_content and self.nft_type == 'map': |
|
|
|
self._target_content = self.validate_map_data(target_content) |
|
|
|
else: |
|
|
|
self._target_content = set() |
|
|
|
|
|
|
@ -181,6 +200,9 @@ class NetfilterSet: |
|
|
|
def filter(self, elements): |
|
|
|
return (self.filters[i](element) for i, element in enumerate(elements)) |
|
|
|
|
|
|
|
def filter_key(self, elements): |
|
|
|
return (self.key_filters[i](element) for i, element in enumerate(elements)) |
|
|
|
|
|
|
|
def set_type(self, type_): |
|
|
|
"""Check set type validity and store it along with a type checker.""" |
|
|
|
for element_type in type_: |
|
|
@ -188,6 +210,13 @@ class NetfilterSet: |
|
|
|
raise ValueError('Invalid type: "{}".'.format(element_type)) |
|
|
|
self.type = type_ |
|
|
|
|
|
|
|
def set_type_from(self, type_): |
|
|
|
"""Check set type validity and store it along with a type checker.""" |
|
|
|
for element_type in type_: |
|
|
|
if element_type not in self.TYPES: |
|
|
|
raise ValueError('Invalid type: "{}".'.format(element_type)) |
|
|
|
self.type_from = type_ |
|
|
|
|
|
|
|
def set_address_family(self, address_family='ip'): |
|
|
|
"""Set set addres_family, defaulting to "ip" like nftables.""" |
|
|
|
if address_family not in self.ADDRESS_FAMILIES: |
|
|
@ -200,7 +229,7 @@ class NetfilterSet: |
|
|
|
for f in flags_: |
|
|
|
if f not in self.FLAGS: |
|
|
|
raise ValueError('Invalid flag: "{}".'.format(f)) |
|
|
|
self.flags = _flags |
|
|
|
self.flags = set(flags_) |
|
|
|
|
|
|
|
def create_in_kernel(self): |
|
|
|
"""Create the set, removing existing set if needed.""" |
|
|
@ -217,21 +246,35 @@ class NetfilterSet: |
|
|
|
"""Delete the set, table and set must exist.""" |
|
|
|
CommandExec.run([ |
|
|
|
*self.nft, |
|
|
|
'delete set {addr_family} {table} {set_}'.format( |
|
|
|
'delete {nft_type} {addr_family} {table} {set_}'.format( |
|
|
|
nft_type=self.nft_type, |
|
|
|
addr_family=self.address_family, table=self.table, |
|
|
|
set_=self.name) |
|
|
|
]) |
|
|
|
|
|
|
|
def _create_new_set_in_kernel(self): |
|
|
|
"""Create the non-existing set, creating table if needed.""" |
|
|
|
create_set = [ |
|
|
|
*self.nft, |
|
|
|
'add set {addr_family} {table} {set_} {{ type {type_} ; flags {flags}}}'.format( |
|
|
|
addr_family=self.address_family, table=self.table, |
|
|
|
if self.flags: |
|
|
|
nft_command = 'add {nft_type} {addr_family} {table} {set_} {{ type {type_} ; flags {flags};}}'.format( |
|
|
|
nft_type=self.nft_type, |
|
|
|
addr_family=self.address_family, |
|
|
|
table=self.table, |
|
|
|
set_=self.name, |
|
|
|
type_=' . '.join(self.TYPES[i] for i in self.type)), |
|
|
|
type_=self.format_type(), |
|
|
|
flags=', '.join(self.flags) |
|
|
|
] |
|
|
|
) |
|
|
|
else: |
|
|
|
nft_command = 'add {nft_type} {addr_family} {table} {set_} {{ type {type_} ;}}'.format( |
|
|
|
nft_type=self.nft_type, |
|
|
|
addr_family=self.address_family, |
|
|
|
table=self.table, |
|
|
|
set_=self.name, |
|
|
|
type_=self.format_type(), |
|
|
|
) |
|
|
|
create_set = [ |
|
|
|
*self.nft, |
|
|
|
nft_command |
|
|
|
] |
|
|
|
return_code = CommandExec.run(create_set, allowed_return_codes=(0, 1)) |
|
|
|
if return_code == 0: |
|
|
|
return # Set creation successful. |
|
|
@ -261,7 +304,33 @@ class NetfilterSet: |
|
|
|
.format(len(errors), '",\n"'.join(map(str, errors)))) |
|
|
|
return set_ |
|
|
|
|
|
|
|
def validate_map_data(self, dict_data): |
|
|
|
""" |
|
|
|
Validate data, returning it or raising a ValueError. |
|
|
|
|
|
|
|
For MAC-IPv4 set, data must be an iterable of (MAC, IPv4) iterables. |
|
|
|
""" |
|
|
|
set_ = {} |
|
|
|
errors = [] |
|
|
|
for key in dict_data: |
|
|
|
try: |
|
|
|
set_[tuple(self.filter_key(key))] = tuple(self.filter(dict_data[key])) |
|
|
|
except Exception as err: |
|
|
|
errors.append(err) |
|
|
|
if errors: |
|
|
|
raise ValueError( |
|
|
|
'Error parsing data, encountered the folowing {} errors.\n"{}"' |
|
|
|
.format(len(errors), '",\n"'.join(map(str, errors)))) |
|
|
|
return set_ |
|
|
|
|
|
|
|
def _apply_target_content(self): |
|
|
|
"""Change netfilter content to target set.""" |
|
|
|
if self.nft_type == 'set': |
|
|
|
self._apply_target_content_set() |
|
|
|
else: |
|
|
|
self._apply_target_content_map() |
|
|
|
|
|
|
|
def _apply_target_content_set(self): |
|
|
|
"""Change netfilter set content to target set.""" |
|
|
|
current_set = self.get_netfilter_set_content() |
|
|
|
if current_set is None: |
|
|
@ -272,6 +341,23 @@ class NetfilterSet: |
|
|
|
to_add = self._target_content - current_set |
|
|
|
self._change_set_content(delete=to_delete, add=to_add) |
|
|
|
|
|
|
|
def _apply_target_content_map(self): |
|
|
|
"""Change netfilter set content to target set.""" |
|
|
|
current_map = self.get_netfilter_map_content() |
|
|
|
if current_map is None: |
|
|
|
raise ValueError('Cannot change "{}" netfilter map content: map ' |
|
|
|
'do not exist in "{}" "{}".'.format( |
|
|
|
self.name, self.address_family, self.table)) |
|
|
|
keys_to_delete = current_map.keys() - self._target_content.keys() |
|
|
|
keys_to_add = self._target_content.keys() - current_map.keys() |
|
|
|
keys_to_check = current_map.keys() & self._target_content.keys() |
|
|
|
for k in keys_to_check: |
|
|
|
if current_map[k] != self._target_content[k]: |
|
|
|
keys_to_add.add(k) |
|
|
|
keys_to_delete.add(k) |
|
|
|
to_add = {k : self._target_content[k] for k in keys_to_add} |
|
|
|
self._change_map_content(delete=keys_to_delete, add=to_add) |
|
|
|
|
|
|
|
def _change_set_content(self, delete=None, add=None): |
|
|
|
todo = [tuple_ for tuple_ in (('add', add), ('delete', delete)) |
|
|
|
if tuple_[1]] |
|
|
@ -286,6 +372,32 @@ class NetfilterSet: |
|
|
|
] |
|
|
|
CommandExec.run(command) |
|
|
|
|
|
|
|
def _change_map_content(self, delete=None, add=None): |
|
|
|
if delete: |
|
|
|
content = ', '.join(' . '.join(str(element) for element in tuple_) |
|
|
|
for tuple_ in delete) |
|
|
|
command = [ |
|
|
|
*self.nft, |
|
|
|
'delete element {addr_family} {table} {set_} {{{content}}}' \ |
|
|
|
.format(addr_family=self.address_family, |
|
|
|
table=self.table, set_=self.name, content=content) |
|
|
|
] |
|
|
|
CommandExec.run(command) |
|
|
|
if add: |
|
|
|
content = ', '.join( |
|
|
|
' . '.join(str(element) for element in tuple_) |
|
|
|
+ ' : ' |
|
|
|
+ ' . '.join(str(element) for element in add[tuple_]) |
|
|
|
for tuple_ in add |
|
|
|
) |
|
|
|
command = [ |
|
|
|
*self.nft, |
|
|
|
'add element {addr_family} {table} {set_} {{{content}}}' \ |
|
|
|
.format(addr_family=self.address_family, |
|
|
|
table=self.table, set_=self.name, content=content) |
|
|
|
] |
|
|
|
CommandExec.run(command) |
|
|
|
|
|
|
|
def _get_raw_netfilter_set(self, parse_elements=True): |
|
|
|
"""Return a dict describing the netfilter set matching self or None.""" |
|
|
|
_, stdout, _ = CommandExec.run_check_output( |
|
|
@ -301,9 +413,25 @@ class NetfilterSet: |
|
|
|
if netfilter_set['name'] != self.name \ |
|
|
|
or netfilter_set['address_family'] != self.address_family \ |
|
|
|
or netfilter_set['table'] != self.table \ |
|
|
|
or netfilter_set['type'] != [ |
|
|
|
self.TYPES[type_] for type_ in self.type]: |
|
|
|
raise ValueError('Did not get the right set, too wrong to fix.') |
|
|
|
or not self.has_type(netfilter_set['type']) \ |
|
|
|
or netfilter_set.get('flags', set()) != self.flags: |
|
|
|
raise ValueError( |
|
|
|
'Did not get the right set, too wrong to fix. Got ' |
|
|
|
+ str(netfilter_set) |
|
|
|
+ ("\nExpected : " |
|
|
|
"\n\tname: {name}" |
|
|
|
"\n\taddress_family: {family}" |
|
|
|
"\n\ttable: {table}" |
|
|
|
"\n\tflags: {flags}" |
|
|
|
"\n\ttypes: {types}" |
|
|
|
).format( |
|
|
|
name=self.name, |
|
|
|
family=self.address_family, |
|
|
|
table=self.table, |
|
|
|
flags=self.flags, |
|
|
|
types=tuple(self.TYPES[t] for t in self.type) |
|
|
|
) |
|
|
|
) |
|
|
|
if parse_elements: |
|
|
|
if netfilter_set['raw_content']: |
|
|
|
netfilter_set['content'] = self.validate_set_data(( |
|
|
@ -313,21 +441,79 @@ class NetfilterSet: |
|
|
|
netfilter_set['content'] = set() |
|
|
|
return netfilter_set |
|
|
|
|
|
|
|
def _get_raw_netfilter_map(self, parse_elements=True): |
|
|
|
"""Return a dict describing the netfilter map matching self or None.""" |
|
|
|
_, stdout, _ = CommandExec.run_check_output( |
|
|
|
[*self.nft, '-nn', 'list map {addr_family} {table} {set_}'.format( |
|
|
|
addr_family=self.address_family, table=self.table, |
|
|
|
set_=self.name)], |
|
|
|
allowed_return_codes=(0, 1) # In case table do not exist |
|
|
|
) |
|
|
|
if not stdout: |
|
|
|
return None |
|
|
|
else: |
|
|
|
netfilter_set = self._parse_netfilter_map_string(stdout) |
|
|
|
if netfilter_set['name'] != self.name \ |
|
|
|
or netfilter_set['address_family'] != self.address_family \ |
|
|
|
or netfilter_set['table'] != self.table \ |
|
|
|
or not self.has_type(netfilter_set['type']): |
|
|
|
raise ValueError('Did not get the right map, too wrong to fix.') |
|
|
|
if parse_elements: |
|
|
|
if netfilter_set['raw_content']: |
|
|
|
netfilter_set['content'] = self.validate_map_data({ |
|
|
|
(element.strip() for element in n_uplet.split(' : ')[0].split(' . ')) : |
|
|
|
(element.strip() for element in n_uplet.split(' : ')[1].split(' . ')) |
|
|
|
for n_uplet in netfilter_set['raw_content'].split(',') |
|
|
|
}) |
|
|
|
else: |
|
|
|
netfilter_set['content'] = {} |
|
|
|
return netfilter_set |
|
|
|
|
|
|
|
@staticmethod |
|
|
|
def _parse_netfilter_set_string(set_string): |
|
|
|
""" |
|
|
|
Parse netfilter set definition and return set as dict. |
|
|
|
|
|
|
|
Do not validate content type against detected set type. |
|
|
|
Return a dict with 'name', 'address_family', 'table', 'type', |
|
|
|
Return a dict with 'name', 'address_family', 'table', 'type', 'flags', |
|
|
|
'raw_content' keys (all strings, 'raw_content' can be None). |
|
|
|
Raise ValueError in case of unexpected syntax. |
|
|
|
""" |
|
|
|
# A.K.A. Really, I don't hate you, so please don't hate me... |
|
|
|
regexp = ( |
|
|
|
"table (?P<address_family>\w+)+ (?P<table>\w+) \{\n" |
|
|
|
"\s*set (?P<name>\w+) \{\n" |
|
|
|
"\s*type (?P<type>(\w+( \. )?)+)\n" |
|
|
|
"(\s*elements = \{ " |
|
|
|
"(?P<elements>((\n\s*)?([\w:\.]+( \. )?)+,?)*) " |
|
|
|
"\}\n)?" |
|
|
|
"\s*\}\n" |
|
|
|
"\s*\}" |
|
|
|
) |
|
|
|
values = re.match(regexp, set_string).groupdict() |
|
|
|
return { |
|
|
|
'address_family': values['address_family'], |
|
|
|
'table': values['table'], |
|
|
|
'name': values['name'], |
|
|
|
'type': values['type'].split(' . '), |
|
|
|
'raw_content': values['elements'], |
|
|
|
} |
|
|
|
|
|
|
|
@staticmethod |
|
|
|
def _parse_netfilter_map_string(set_string): |
|
|
|
""" |
|
|
|
Parse netfilter map definition and return map as dict. |
|
|
|
|
|
|
|
Do not validate content type against detected map type. |
|
|
|
Return a dict with 'name', 'address_family', 'table', 'type', 'flags' |
|
|
|
'raw_content' keys (all strings, 'raw_content' can be None). |
|
|
|
Raise ValueError in case of unexpected syntax. |
|
|
|
""" |
|
|
|
# Fragile code since using lexer / parser would be quite heavy |
|
|
|
lines = [line.lstrip('\t ') for line in set_string.strip().splitlines()] |
|
|
|
errors = [] |
|
|
|
# 5 lines when empty, 6 with elements = { … } |
|
|
|
if len(lines) not in (5, 6): |
|
|
|
# 5 lines when empty, 6 with elements = { … } + one for flags |
|
|
|
if len(lines) not in (5, 6, 7): |
|
|
|
errors.append('Error, expecting 5 or 6 lines for set definition, ' |
|
|
|
'got "{}".'.format(set_string)) |
|
|
|
|
|
|
@ -346,30 +532,54 @@ class NetfilterSet: |
|
|
|
|
|
|
|
line = next(line_iterator).split(' ') # line #2 |
|
|
|
# 'set <name> {' |
|
|
|
if len(line) != 3 or line[0] != 'set' or line[2] != '{': |
|
|
|
if len(line) != 3 or line[0] != 'map' or line[2] != '{': |
|
|
|
errors.append('Cannot parse set definition, expecting "set <name> ' |
|
|
|
'{{", got "{}".' .format(' '.join(line))) |
|
|
|
else: |
|
|
|
set_definition['name'] = line[1] |
|
|
|
|
|
|
|
line = next(line_iterator).split(' ') # line #3 |
|
|
|
# 'type <type> [. <type>]...' |
|
|
|
if len(line) < 2 or len(line) % 2 != 0 or line[0] != 'type' \ |
|
|
|
or any(element != '.' for element in line[2::2]): |
|
|
|
line, elements_type = next(line_iterator).split(' : ') # line #3 |
|
|
|
# 'type <type> [. <type>]... : <type> [. <type>]...' |
|
|
|
line = line.split(' ') |
|
|
|
if len(line) < 2: |
|
|
|
errors.append( |
|
|
|
'Cannot parse type definition, left side of \':\' is too short : %s' % line |
|
|
|
) |
|
|
|
type_, keys_type = line[0], line[1:] |
|
|
|
elements_type = elements_type.split(' ') |
|
|
|
if type_ != 'type': |
|
|
|
errors.append( |
|
|
|
'Cannot parse type definition, expected first word \'type\', got %s' % type_ |
|
|
|
) |
|
|
|
elif len(elements_type) % 2 != 1 or len(keys_type) % 2 != 1 \ |
|
|
|
or any(e != '.' for e in elements_type[1::2]) \ |
|
|
|
or any(e != '.' for e in keys_type[1::2]): |
|
|
|
errors.append( |
|
|
|
'Cannot parse type definition, expecting "type <type> ' |
|
|
|
'[. <type>]...", got "{}".'.format(' '.join(line))) |
|
|
|
'[. <type>]... : <type> [. <type>]...", got "{}".'.format(' '.join(line))) |
|
|
|
else: |
|
|
|
set_definition['type'] = line[1::2] |
|
|
|
set_definition['type'] = (keys_type[::2], elements_type[::2]) |
|
|
|
|
|
|
|
if len(lines) == 6: |
|
|
|
# here we can have the flags, if there are any |
|
|
|
# flags <flag_1>, <flag_2>, ... |
|
|
|
if len(lines) >= 6: |
|
|
|
line = next(line_iterator) |
|
|
|
if line[:5] == 'flags': # If there are actually flags |
|
|
|
set_definition['flags'] = {f.strip() for f in line[:5].strip().split(',')} |
|
|
|
|
|
|
|
if len(lines) >= 6: |
|
|
|
# set is not empty, getting raw elements |
|
|
|
line = next(line_iterator) # Unsplit line #4 |
|
|
|
if line[:13] != 'elements = { ' or line[-1] != '}': |
|
|
|
errors.append('Cannot parse set elements, expecting "elements ' |
|
|
|
if 'flags' in set_definition and len(lines) == 7: # the line unsplitted previously has been used. |
|
|
|
line = next(line_iterator) # Unsplit line #4 |
|
|
|
print(line) |
|
|
|
if ('flags' in set_definition and len(lines)==7) or ('flags' not in set_definition and len(lines)==6) : |
|
|
|
if line[:13] != 'elements = { ' or line[-1] != '}': |
|
|
|
errors.append('Cannot parse set elements, expecting "elements ' |
|
|
|
'= {{ <…>}}", got "{}".'.format(line)) |
|
|
|
else: |
|
|
|
set_definition['raw_content'] = line[13:-1].strip() |
|
|
|
else: |
|
|
|
set_definition['raw_content'] = line[13:-1].strip() |
|
|
|
set_definition['raw_content'] = None |
|
|
|
else: |
|
|
|
set_definition['raw_content'] = None |
|
|
|
|
|
|
@ -393,22 +603,41 @@ class NetfilterSet: |
|
|
|
else: |
|
|
|
return netfilter_set['content'] |
|
|
|
|
|
|
|
def get_netfilter_map_content(self): |
|
|
|
"""Return current set content from netfilter.""" |
|
|
|
netfilter_set = self._get_raw_netfilter_map(parse_elements=True) |
|
|
|
if netfilter_set is None: |
|
|
|
return None |
|
|
|
else: |
|
|
|
return netfilter_set['content'] |
|
|
|
|
|
|
|
def has_type(self, type_): |
|
|
|
"""Check if some type match the set's one.""" |
|
|
|
return tuple(self.TYPES[t] for t in self.type) == tuple(type_) |
|
|
|
if self.nft_type == 'set': |
|
|
|
return tuple(self.TYPES[t] for t in self.type) == tuple(type_) |
|
|
|
else: |
|
|
|
return tuple(self.TYPES[t] for t in self.type) == tuple(type_[1]) and \ |
|
|
|
tuple(self.TYPES[t] for t in self.type_from) == tuple(type_[0]) |
|
|
|
|
|
|
|
def manage(self): |
|
|
|
"""Create set if needed and populate it with target content.""" |
|
|
|
self.create_in_kernel() |
|
|
|
self._apply_target_content() |
|
|
|
|
|
|
|
def format_type(self): |
|
|
|
if self.nft_type == 'set': |
|
|
|
return ' . '.join(self.TYPES[i] for i in self.type) |
|
|
|
else: |
|
|
|
return ' . '.join(self.TYPES[i] for i in self.type_from) + ' : ' + ' . '.join(self.TYPES[i] for i in self.type) |
|
|
|
|
|
|
|
|
|
|
|
class Firewall: |
|
|
|
"""Manages the firewall using nftables.""" |
|
|
|
|
|
|
|
@staticmethod |
|
|
|
def manage_sets(sets, address_family=None, table=None, use_sudo=None): |
|
|
|
CONFIG = Config() |
|
|
|
CONFIG = ConfigParser() |
|
|
|
CONFIG.read('config.ini') |
|
|
|
address_family = address_family or CONFIG['address_family'] or 'inet' |
|
|
|
table = table or CONFIG['table'] or 'filter' |
|
|
|
sudo = use_sudo or (use_sudo is None and CONFIG['use_sudo']) |
|
|
|