825 lines
26 KiB
Python
825 lines
26 KiB
Python
#!/usr/bin/env python3
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"""
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Utility functions to interact with the database.
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"""
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import typing
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import time
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import logging
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import coloredlogs
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import pickle
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import numpy
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import math
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import os
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TLD_LIST: typing.Set[str] = set()
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coloredlogs.install(
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level='DEBUG',
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fmt='%(asctime)s %(name)s %(levelname)s %(message)s'
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)
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Asn = int
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Timestamp = int
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Level = int
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class Path():
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# FP add boolean here
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pass
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class RulePath(Path):
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def __str__(self) -> str:
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return '(rule)'
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class RuleFirstPath(RulePath):
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def __str__(self) -> str:
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return '(first-party rule)'
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class RuleMultiPath(RulePath):
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def __str__(self) -> str:
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return '(multi-party rule)'
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class DomainPath(Path):
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def __init__(self, parts: typing.List[str]):
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self.parts = parts
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def __str__(self) -> str:
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return '?.' + Database.unpack_domain(self)
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class HostnamePath(DomainPath):
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def __str__(self) -> str:
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return Database.unpack_domain(self)
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class ZonePath(DomainPath):
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def __str__(self) -> str:
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return '*.' + Database.unpack_domain(self)
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class AsnPath(Path):
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def __init__(self, asn: Asn):
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self.asn = asn
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def __str__(self) -> str:
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return Database.unpack_asn(self)
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class Ip4Path(Path):
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def __init__(self, value: int, prefixlen: int):
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self.value = value
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self.prefixlen = prefixlen
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def __str__(self) -> str:
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return Database.unpack_ip4network(self)
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class Match():
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def __init__(self) -> None:
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self.source: typing.Optional[Path] = None
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self.updated: int = 0
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self.dupplicate: bool = False
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# Cache
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self.level: int = 0
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self.first_party: bool = False
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self.references: int = 0
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def active(self, first_party: bool = None) -> bool:
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if self.updated == 0 or (first_party and not self.first_party):
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return False
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return True
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def disable(self) -> None:
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self.updated = 0
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class AsnNode(Match):
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def __init__(self) -> None:
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Match.__init__(self)
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self.name = ''
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class DomainTreeNode():
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def __init__(self) -> None:
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self.children: typing.Dict[str, DomainTreeNode] = dict()
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self.match_zone = Match()
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self.match_hostname = Match()
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class IpTreeNode(Match):
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def __init__(self) -> None:
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Match.__init__(self)
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self.zero: typing.Optional[IpTreeNode] = None
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self.one: typing.Optional[IpTreeNode] = None
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Node = typing.Union[DomainTreeNode, IpTreeNode, AsnNode]
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MatchCallable = typing.Callable[[Path,
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Match],
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typing.Any]
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class Profiler():
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def __init__(self) -> None:
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do_profile = int(os.environ.get('PROFILE', '0'))
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if do_profile:
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self.log = logging.getLogger('profiler')
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self.time_last = time.perf_counter()
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self.time_step = 'init'
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self.time_dict: typing.Dict[str, float] = dict()
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self.step_dict: typing.Dict[str, int] = dict()
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self.enter_step = self.enter_step_real
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self.profile = self.profile_real
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else:
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self.enter_step = self.enter_step_dummy
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self.profile = self.profile_dummy
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def enter_step_dummy(self, name: str) -> None:
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return
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def enter_step_real(self, name: str) -> None:
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now = time.perf_counter()
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try:
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self.time_dict[self.time_step] += now - self.time_last
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self.step_dict[self.time_step] += int(name != self.time_step)
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except KeyError:
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self.time_dict[self.time_step] = now - self.time_last
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self.step_dict[self.time_step] = 1
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self.time_step = name
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self.time_last = time.perf_counter()
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def profile_dummy(self) -> None:
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return
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def profile_real(self) -> None:
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self.enter_step('profile')
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total = sum(self.time_dict.values())
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for key, secs in sorted(self.time_dict.items(), key=lambda t: t[1]):
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times = self.step_dict[key]
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self.log.debug(f"{key:<20}: {times:9d} × {secs/times:5.3e} "
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f"= {secs:9.2f} s ({secs/total:7.2%}) ")
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self.log.debug(f"{'total':<20}: "
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f"{total:9.2f} s ({1:7.2%})")
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class Database(Profiler):
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VERSION = 18
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PATH = "blocking.p"
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def initialize(self) -> None:
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self.log.warning(
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"Creating database version: %d ",
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Database.VERSION)
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# Dummy match objects that everything refer to
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self.rules: typing.List[Match] = list()
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for first_party in (False, True):
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m = Match()
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m.updated = 1
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m.level = 0
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m.first_party = first_party
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self.rules.append(m)
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self.domtree = DomainTreeNode()
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self.asns: typing.Dict[Asn, AsnNode] = dict()
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self.ip4tree = IpTreeNode()
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def load(self) -> None:
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self.enter_step('load')
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try:
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with open(self.PATH, 'rb') as db_fdsec:
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version, data = pickle.load(db_fdsec)
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if version == Database.VERSION:
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self.rules, self.domtree, self.asns, self.ip4tree = data
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return
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self.log.warning(
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"Outdated database version found: %d, "
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"it will be rebuilt.",
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version)
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except (TypeError, AttributeError, EOFError):
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self.log.error(
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"Corrupt (or heavily outdated) database found, "
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"it will be rebuilt.")
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except FileNotFoundError:
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pass
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self.initialize()
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def save(self) -> None:
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self.enter_step('save')
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with open(self.PATH, 'wb') as db_fdsec:
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data = self.rules, self.domtree, self.asns, self.ip4tree
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pickle.dump((self.VERSION, data), db_fdsec)
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self.profile()
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def __init__(self) -> None:
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Profiler.__init__(self)
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self.log = logging.getLogger('db')
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self.load()
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self.ip4cache_shift: int = 32
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self.ip4cache = numpy.ones(1)
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def _set_ip4cache(self, path: Path, _: Match) -> None:
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assert isinstance(path, Ip4Path)
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self.enter_step('set_ip4cache')
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mini = path.value >> self.ip4cache_shift
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maxi = (path.value + 2**(32-path.prefixlen)) >> self.ip4cache_shift
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if mini == maxi:
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self.ip4cache[mini] = True
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else:
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self.ip4cache[mini:maxi] = True
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def fill_ip4cache(self, max_size: int = 512*1024**2) -> None:
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"""
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Size in bytes
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"""
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if max_size > 2**32/8:
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self.log.warning("Allocating more than 512 MiB of RAM for "
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"the Ip4 cache is not necessary.")
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max_cache_width = int(math.log2(max(1, max_size*8)))
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allocated = False
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cache_width = min(2**32, max_cache_width)
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while not allocated:
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cache_size = 2**cache_width
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try:
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self.ip4cache = numpy.zeros(cache_size, dtype=numpy.bool)
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except MemoryError:
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self.log.exception(
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"Could not allocate cache. Retrying a smaller one.")
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cache_width -= 1
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continue
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allocated = True
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self.ip4cache_shift = 32-cache_width
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for _ in self.exec_each_ip4(self._set_ip4cache):
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pass
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@staticmethod
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def populate_tld_list() -> None:
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with open('temp/all_tld.list', 'r') as tld_fdesc:
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for tld in tld_fdesc:
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tld = tld.strip()
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TLD_LIST.add(tld)
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@staticmethod
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def validate_domain(path: str) -> bool:
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if len(path) > 255:
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return False
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splits = path.split('.')
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if not TLD_LIST:
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Database.populate_tld_list()
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if splits[-1] not in TLD_LIST:
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return False
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for split in splits:
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if not 1 <= len(split) <= 63:
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return False
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return True
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@staticmethod
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def pack_domain(domain: str) -> DomainPath:
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return DomainPath(domain.split('.')[::-1])
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@staticmethod
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def unpack_domain(domain: DomainPath) -> str:
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return '.'.join(domain.parts[::-1])
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@staticmethod
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def pack_asn(asn: str) -> AsnPath:
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asn = asn.upper()
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if asn.startswith('AS'):
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asn = asn[2:]
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return AsnPath(int(asn))
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@staticmethod
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def unpack_asn(asn: AsnPath) -> str:
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return f'AS{asn.asn}'
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@staticmethod
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def validate_ip4address(path: str) -> bool:
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splits = path.split('.')
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if len(splits) != 4:
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return False
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for split in splits:
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try:
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if not 0 <= int(split) <= 255:
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return False
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except ValueError:
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return False
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return True
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@staticmethod
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def pack_ip4address_low(address: str) -> int:
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addr = 0
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for split in address.split('.'):
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octet = int(split)
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addr = (addr << 8) + octet
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return addr
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@staticmethod
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def pack_ip4address(address: str) -> Ip4Path:
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return Ip4Path(Database.pack_ip4address_low(address), 32)
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@staticmethod
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def unpack_ip4address(address: Ip4Path) -> str:
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addr = address.value
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assert address.prefixlen == 32
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octets: typing.List[int] = list()
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octets = [0] * 4
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for o in reversed(range(4)):
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octets[o] = addr & 0xFF
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addr >>= 8
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return '.'.join(map(str, octets))
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@staticmethod
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def validate_ip4network(path: str) -> bool:
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# A bit generous but ok for our usage
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splits = path.split('/')
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if len(splits) != 2:
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return False
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if not Database.validate_ip4address(splits[0]):
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return False
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try:
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if not 0 <= int(splits[1]) <= 32:
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return False
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except ValueError:
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return False
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return True
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@staticmethod
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def pack_ip4network(network: str) -> Ip4Path:
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address, prefixlen_str = network.split('/')
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prefixlen = int(prefixlen_str)
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addr = Database.pack_ip4address(address)
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addr.prefixlen = prefixlen
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return addr
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@staticmethod
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def unpack_ip4network(network: Ip4Path) -> str:
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addr = network.value
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octets: typing.List[int] = list()
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octets = [0] * 4
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for o in reversed(range(4)):
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octets[o] = addr & 0xFF
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addr >>= 8
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return '.'.join(map(str, octets)) + '/' + str(network.prefixlen)
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def get_match(self, path: Path) -> Match:
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if isinstance(path, RuleMultiPath):
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return self.rules[0]
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elif isinstance(path, RuleFirstPath):
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return self.rules[1]
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elif isinstance(path, AsnPath):
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return self.asns[path.asn]
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elif isinstance(path, DomainPath):
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dicd = self.domtree
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for part in path.parts:
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dicd = dicd.children[part]
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if isinstance(path, HostnamePath):
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return dicd.match_hostname
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elif isinstance(path, ZonePath):
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return dicd.match_zone
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else:
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raise ValueError
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elif isinstance(path, Ip4Path):
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dici = self.ip4tree
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for i in range(31, 31-path.prefixlen, -1):
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bit = (path.value >> i) & 0b1
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dici_next = dici.one if bit else dici.zero
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if not dici_next:
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raise IndexError
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dici = dici_next
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return dici
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else:
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raise ValueError
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def exec_each_asn(self,
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callback: MatchCallable,
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) -> typing.Any:
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for asn in self.asns:
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match = self.asns[asn]
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if match.active():
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c = callback(
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AsnPath(asn),
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match,
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)
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try:
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yield from c
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except TypeError: # not iterable
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pass
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def exec_each_domain(self,
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callback: MatchCallable,
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_dic: DomainTreeNode = None,
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_par: DomainPath = None,
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) -> typing.Any:
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_dic = _dic or self.domtree
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_par = _par or DomainPath([])
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if _dic.match_hostname.active():
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c = callback(
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HostnamePath(_par.parts),
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_dic.match_hostname,
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)
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try:
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yield from c
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except TypeError: # not iterable
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pass
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if _dic.match_zone.active():
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c = callback(
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ZonePath(_par.parts),
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_dic.match_zone,
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)
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try:
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yield from c
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except TypeError: # not iterable
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pass
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for part in _dic.children:
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dic = _dic.children[part]
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yield from self.exec_each_domain(
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callback,
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_dic=dic,
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_par=DomainPath(_par.parts + [part])
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)
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def exec_each_ip4(self,
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callback: MatchCallable,
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_dic: IpTreeNode = None,
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_par: Ip4Path = None,
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) -> typing.Any:
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_dic = _dic or self.ip4tree
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_par = _par or Ip4Path(0, 0)
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if _dic.active():
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c = callback(
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_par,
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_dic,
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)
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try:
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yield from c
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except TypeError: # not iterable
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pass
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# 0
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pref = _par.prefixlen + 1
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dic = _dic.zero
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if dic:
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# addr0 = _par.value & (0xFFFFFFFF ^ (1 << (32-pref)))
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# assert addr0 == _par.value
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addr0 = _par.value
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yield from self.exec_each_ip4(
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callback,
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_dic=dic,
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_par=Ip4Path(addr0, pref)
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)
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# 1
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dic = _dic.one
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if dic:
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addr1 = _par.value | (1 << (32-pref))
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# assert addr1 != _par.value
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yield from self.exec_each_ip4(
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callback,
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_dic=dic,
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_par=Ip4Path(addr1, pref)
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)
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def exec_each(self,
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callback: MatchCallable,
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) -> typing.Any:
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yield from self.exec_each_domain(callback)
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yield from self.exec_each_ip4(callback)
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yield from self.exec_each_asn(callback)
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def update_references(self) -> None:
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# Should be correctly calculated normally,
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# keeping this just in case
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def reset_references_cb(path: Path,
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match: Match
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) -> None:
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match.references = 0
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for _ in self.exec_each(reset_references_cb):
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pass
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def increment_references_cb(path: Path,
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match: Match
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) -> None:
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if match.source:
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source = self.get_match(match.source)
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source.references += 1
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for _ in self.exec_each(increment_references_cb):
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pass
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def _clean_deps(self) -> None:
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# Disable the matches that depends on the targeted
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# matches until all disabled matches reference count = 0
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did_something = True
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def clean_deps_cb(path: Path,
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match: Match
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) -> None:
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nonlocal did_something
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if not match.source:
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return
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source = self.get_match(match.source)
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if not source.active():
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self._unset_match(match)
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elif match.first_party > source.first_party:
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match.first_party = source.first_party
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else:
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return
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did_something = True
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while did_something:
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did_something = False
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self.enter_step('pass_clean_deps')
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for _ in self.exec_each(clean_deps_cb):
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pass
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def prune(self, before: int, base_only: bool = False) -> None:
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# Disable the matches targeted
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def prune_cb(path: Path,
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match: Match
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) -> None:
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if base_only and match.level > 1:
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return
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if match.updated > before:
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return
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self._unset_match(match)
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self.log.debug("Print: disabled %s", path)
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self.enter_step('pass_prune')
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for _ in self.exec_each(prune_cb):
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pass
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|
||
self._clean_deps()
|
||
|
||
# Remove branches with no match
|
||
# TODO
|
||
|
||
def explain(self, path: Path) -> str:
|
||
match = self.get_match(path)
|
||
string = str(path)
|
||
if isinstance(match, AsnNode):
|
||
string += f' ({match.name})'
|
||
party_char = 'F' if match.first_party else 'M'
|
||
dup_char = 'D' if match.dupplicate else '_'
|
||
string += f' {match.level}{party_char}{dup_char}{match.references}'
|
||
if match.source:
|
||
string += f' ← {self.explain(match.source)}'
|
||
return string
|
||
|
||
def list_records(self,
|
||
first_party_only: bool = False,
|
||
end_chain_only: bool = False,
|
||
no_dupplicates: bool = False,
|
||
rules_only: bool = False,
|
||
hostnames_only: bool = False,
|
||
explain: bool = False,
|
||
) -> typing.Iterable[str]:
|
||
|
||
def export_cb(path: Path, match: Match
|
||
) -> typing.Iterable[str]:
|
||
if first_party_only and not match.first_party:
|
||
return
|
||
if end_chain_only and match.references > 0:
|
||
return
|
||
if no_dupplicates and match.dupplicate:
|
||
return
|
||
if rules_only and match.level > 1:
|
||
return
|
||
if hostnames_only and not isinstance(path, HostnamePath):
|
||
return
|
||
|
||
if explain:
|
||
yield self.explain(path)
|
||
else:
|
||
yield str(path)
|
||
|
||
yield from self.exec_each(export_cb)
|
||
|
||
def count_records(self,
|
||
first_party_only: bool = False,
|
||
end_chain_only: bool = False,
|
||
no_dupplicates: bool = False,
|
||
rules_only: bool = False,
|
||
hostnames_only: bool = False,
|
||
) -> str:
|
||
memo: typing.Dict[str, int] = dict()
|
||
|
||
def count_records_cb(path: Path, match: Match) -> None:
|
||
if first_party_only and not match.first_party:
|
||
return
|
||
if end_chain_only and match.references > 0:
|
||
return
|
||
if no_dupplicates and match.dupplicate:
|
||
return
|
||
if rules_only and match.level > 1:
|
||
return
|
||
if hostnames_only and not isinstance(path, HostnamePath):
|
||
return
|
||
|
||
try:
|
||
memo[path.__class__.__name__] += 1
|
||
except KeyError:
|
||
memo[path.__class__.__name__] = 1
|
||
|
||
for _ in self.exec_each(count_records_cb):
|
||
pass
|
||
|
||
split: typing.List[str] = list()
|
||
for key, value in sorted(memo.items(), key=lambda s: s[0]):
|
||
split.append(f'{key[:-4].lower()}s: {value}')
|
||
return ', '.join(split)
|
||
|
||
def get_domain(self, domain_str: str) -> typing.Iterable[DomainPath]:
|
||
self.enter_step('get_domain_pack')
|
||
domain = self.pack_domain(domain_str)
|
||
self.enter_step('get_domain_brws')
|
||
dic = self.domtree
|
||
depth = 0
|
||
for part in domain.parts:
|
||
if dic.match_zone.active():
|
||
self.enter_step('get_domain_yield')
|
||
yield ZonePath(domain.parts[:depth])
|
||
self.enter_step('get_domain_brws')
|
||
if part not in dic.children:
|
||
return
|
||
dic = dic.children[part]
|
||
depth += 1
|
||
if dic.match_zone.active():
|
||
self.enter_step('get_domain_yield')
|
||
yield ZonePath(domain.parts)
|
||
if dic.match_hostname.active():
|
||
self.enter_step('get_domain_yield')
|
||
yield HostnamePath(domain.parts)
|
||
|
||
def get_ip4(self, ip4_str: str) -> typing.Iterable[Path]:
|
||
self.enter_step('get_ip4_pack')
|
||
ip4val = self.pack_ip4address_low(ip4_str)
|
||
self.enter_step('get_ip4_cache')
|
||
if not self.ip4cache[ip4val >> self.ip4cache_shift]:
|
||
return
|
||
self.enter_step('get_ip4_brws')
|
||
dic = self.ip4tree
|
||
for i in range(31, -1, -1):
|
||
bit = (ip4val >> i) & 0b1
|
||
if dic.active():
|
||
self.enter_step('get_ip4_yield')
|
||
yield Ip4Path(ip4val >> (i+1) << (i+1), 31-i)
|
||
self.enter_step('get_ip4_brws')
|
||
next_dic = dic.one if bit else dic.zero
|
||
if next_dic is None:
|
||
return
|
||
dic = next_dic
|
||
if dic.active():
|
||
self.enter_step('get_ip4_yield')
|
||
yield Ip4Path(ip4val, 32)
|
||
|
||
def _unset_match(self,
|
||
match: Match,
|
||
) -> None:
|
||
match.disable()
|
||
if match.source:
|
||
source_match = self.get_match(match.source)
|
||
source_match.references -= 1
|
||
|
||
def _set_match(self,
|
||
match: Match,
|
||
updated: int,
|
||
source: Path,
|
||
source_match: Match = None,
|
||
dupplicate: bool = False,
|
||
) -> None:
|
||
# source_match is in parameters because most of the time
|
||
# its parent function needs it too,
|
||
# so it can pass it to save a traversal
|
||
source_match = source_match or self.get_match(source)
|
||
new_level = source_match.level + 1
|
||
if updated > match.updated or new_level < match.level \
|
||
or source_match.first_party > match.first_party:
|
||
# NOTE FP and level of matches referencing this one
|
||
# won't be updated until run or prune
|
||
if match.source:
|
||
old_source = self.get_match(match.source)
|
||
old_source.references -= 1
|
||
match.updated = updated
|
||
match.level = new_level
|
||
match.first_party = source_match.first_party
|
||
match.source = source
|
||
source_match.references += 1
|
||
match.dupplicate = dupplicate
|
||
|
||
def _set_domain(self,
|
||
hostname: bool,
|
||
domain_str: str,
|
||
updated: int,
|
||
source: Path) -> None:
|
||
self.enter_step('set_domain_val')
|
||
if not Database.validate_domain(domain_str):
|
||
raise ValueError(f"Invalid domain: {domain_str}")
|
||
self.enter_step('set_domain_pack')
|
||
domain = self.pack_domain(domain_str)
|
||
self.enter_step('set_domain_fp')
|
||
source_match = self.get_match(source)
|
||
is_first_party = source_match.first_party
|
||
self.enter_step('set_domain_brws')
|
||
dic = self.domtree
|
||
dupplicate = False
|
||
for part in domain.parts:
|
||
if part not in dic.children:
|
||
dic.children[part] = DomainTreeNode()
|
||
dic = dic.children[part]
|
||
if dic.match_zone.active(is_first_party):
|
||
dupplicate = True
|
||
if hostname:
|
||
match = dic.match_hostname
|
||
else:
|
||
match = dic.match_zone
|
||
self._set_match(
|
||
match,
|
||
updated,
|
||
source,
|
||
source_match=source_match,
|
||
dupplicate=dupplicate,
|
||
)
|
||
|
||
def set_hostname(self,
|
||
*args: typing.Any, **kwargs: typing.Any
|
||
) -> None:
|
||
self._set_domain(True, *args, **kwargs)
|
||
|
||
def set_zone(self,
|
||
*args: typing.Any, **kwargs: typing.Any
|
||
) -> None:
|
||
self._set_domain(False, *args, **kwargs)
|
||
|
||
def set_asn(self,
|
||
asn_str: str,
|
||
updated: int,
|
||
source: Path) -> None:
|
||
self.enter_step('set_asn')
|
||
path = self.pack_asn(asn_str)
|
||
if path.asn in self.asns:
|
||
match = self.asns[path.asn]
|
||
else:
|
||
match = AsnNode()
|
||
self.asns[path.asn] = match
|
||
self._set_match(
|
||
match,
|
||
updated,
|
||
source,
|
||
)
|
||
|
||
def _set_ip4(self,
|
||
ip4: Ip4Path,
|
||
updated: int,
|
||
source: Path) -> None:
|
||
self.enter_step('set_ip4_fp')
|
||
source_match = self.get_match(source)
|
||
is_first_party = source_match.first_party
|
||
self.enter_step('set_ip4_brws')
|
||
dic = self.ip4tree
|
||
dupplicate = False
|
||
for i in range(31, 31-ip4.prefixlen, -1):
|
||
bit = (ip4.value >> i) & 0b1
|
||
next_dic = dic.one if bit else dic.zero
|
||
if next_dic is None:
|
||
next_dic = IpTreeNode()
|
||
if bit:
|
||
dic.one = next_dic
|
||
else:
|
||
dic.zero = next_dic
|
||
dic = next_dic
|
||
if dic.active(is_first_party):
|
||
dupplicate = True
|
||
self._set_match(
|
||
dic,
|
||
updated,
|
||
source,
|
||
source_match=source_match,
|
||
dupplicate=dupplicate,
|
||
)
|
||
self._set_ip4cache(ip4, dic)
|
||
|
||
def set_ip4address(self,
|
||
ip4address_str: str,
|
||
*args: typing.Any, **kwargs: typing.Any
|
||
) -> None:
|
||
self.enter_step('set_ip4add_val')
|
||
if not Database.validate_ip4address(ip4address_str):
|
||
raise ValueError(f"Invalid ip4address: {ip4address_str}")
|
||
self.enter_step('set_ip4add_pack')
|
||
ip4 = self.pack_ip4address(ip4address_str)
|
||
self._set_ip4(ip4, *args, **kwargs)
|
||
|
||
def set_ip4network(self,
|
||
ip4network_str: str,
|
||
*args: typing.Any, **kwargs: typing.Any
|
||
) -> None:
|
||
self.enter_step('set_ip4net_val')
|
||
if not Database.validate_ip4network(ip4network_str):
|
||
raise ValueError(f"Invalid ip4network: {ip4network_str}")
|
||
self.enter_step('set_ip4net_pack')
|
||
ip4 = self.pack_ip4network(ip4network_str)
|
||
self._set_ip4(ip4, *args, **kwargs)
|