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498 lines
20 KiB
Python
498 lines
20 KiB
Python
5 years ago
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# Copyright (c) 2018 gevent contributors. See LICENSE for details.
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# Portions of this code taken from the gogreen project:
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# http://github.com/slideinc/gogreen
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#
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# Copyright (c) 2005-2010 Slide, Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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# * Neither the name of the author nor the names of other
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# Portions of this code taken from the eventlet project:
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# https://github.com/eventlet/eventlet/blob/master/eventlet/support/greendns.py
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# Unless otherwise noted, the files in Eventlet are under the following MIT license:
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# Copyright (c) 2005-2006, Bob Ippolito
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# Copyright (c) 2007-2010, Linden Research, Inc.
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# Copyright (c) 2008-2010, Eventlet Contributors (see AUTHORS)
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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from __future__ import absolute_import, print_function, division
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import sys
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import time
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from _socket import error
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from _socket import gaierror
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from _socket import herror
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from _socket import NI_NUMERICSERV
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from _socket import AF_INET
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from _socket import AF_INET6
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from _socket import AF_UNSPEC
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from _socket import EAI_NONAME
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from _socket import EAI_FAMILY
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import socket
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from gevent.resolver import AbstractResolver
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from gevent.resolver._hostsfile import HostsFile
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from gevent.builtins import __import__ as g_import
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from gevent._compat import string_types
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from gevent._compat import iteritems
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from gevent._config import config
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__all__ = [
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'Resolver',
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]
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# Import the DNS packages to use the gevent modules,
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# even if the system is not monkey-patched. If it *is* already
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# patched, this imports a second copy under a different name,
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# which is probably not strictly necessary, but matches
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# what we've historically done, and allows configuring the resolvers
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# differently.
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def _patch_dns():
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from gevent._patcher import import_patched as importer
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# The dns package itself is empty but defines __all__
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# we make sure to import all of those things now under the
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# patch. Note this triggers two DeprecationWarnings,
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# one of which we could avoid.
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extras = {
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'dns': ('rdata', 'resolver', 'rdtypes'),
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'dns.rdtypes': ('IN', 'ANY', ),
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'dns.rdtypes.IN': ('A', 'AAAA',),
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'dns.rdtypes.ANY': ('SOA', 'PTR'),
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}
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def extra_all(mod_name):
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return extras.get(mod_name, ())
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def after_import_hook(mod):
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# Runs while still in the original patching scope.
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# The dns.rdata:get_rdata_class() function tries to
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# dynamically import modules using __import__ and then walk
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# through the attribute tree to find classes in `dns.rdtypes`.
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# It is critical that this all matches up, otherwise we can
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# get different exception classes that don't get caught.
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# We could patch __import__ to do things at runtime, but it's
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# easier to enumerate the world and populate the cache now
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# before we then switch the names back.
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rdata = mod.rdata
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get_rdata_class = rdata.get_rdata_class
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for rdclass in mod.rdataclass._by_value:
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for rdtype in mod.rdatatype._by_value:
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get_rdata_class(rdclass, rdtype)
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patcher = importer('dns', extra_all, after_import_hook)
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top = patcher.module
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# Now disable the dynamic imports
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def _no_dynamic_imports(name):
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raise ValueError(name)
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top.rdata.__import__ = _no_dynamic_imports
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return top
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dns = _patch_dns()
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resolver = dns.resolver
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dTimeout = dns.resolver.Timeout
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# This is a wrapper for dns.resolver._getaddrinfo with two crucial changes.
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# First, it backports https://github.com/rthalley/dnspython/issues/316
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# from version 2.0. This can be dropped when we support only dnspython 2
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# (which means only Python 3.)
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# Second, it adds calls to sys.exc_clear() to avoid failing tests in
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# test__refcount.py (timeouts) on Python 2. (Actually, this isn't
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# strictly necessary, it was necessary to increase the timeouts in
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# that function because dnspython is doing some parsing/regex/host
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# lookups that are not super fast. But it does have a habit of leaving
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# exceptions around which can complicate our memleak checks.)
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def _getaddrinfo(host=None, service=None, family=AF_UNSPEC, socktype=0,
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proto=0, flags=0,
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_orig_gai=resolver._getaddrinfo,
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_exc_clear=getattr(sys, 'exc_clear', lambda: None)):
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if flags & (socket.AI_ADDRCONFIG | socket.AI_V4MAPPED) != 0:
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# Not implemented. We raise a gaierror as opposed to a
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# NotImplementedError as it helps callers handle errors more
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# appropriately. [Issue #316]
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raise socket.gaierror(socket.EAI_SYSTEM)
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res = _orig_gai(host, service, family, socktype, proto, flags)
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_exc_clear()
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return res
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resolver._getaddrinfo = _getaddrinfo
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HOSTS_TTL = 300.0
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class _HostsAnswer(dns.resolver.Answer):
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# Answer class for HostsResolver object
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def __init__(self, qname, rdtype, rdclass, rrset, raise_on_no_answer=True):
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self.response = None
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self.qname = qname
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self.rdtype = rdtype
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self.rdclass = rdclass
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self.canonical_name = qname
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if not rrset and raise_on_no_answer:
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raise dns.resolver.NoAnswer()
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self.rrset = rrset
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self.expiration = (time.time() +
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rrset.ttl if hasattr(rrset, 'ttl') else 0)
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class _HostsResolver(object):
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"""
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Class to parse the hosts file
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"""
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def __init__(self, fname=None, interval=HOSTS_TTL):
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self.hosts_file = HostsFile(fname)
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self.interval = interval
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self._last_load = 0
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def query(self, qname, rdtype=dns.rdatatype.A, rdclass=dns.rdataclass.IN,
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tcp=False, source=None, raise_on_no_answer=True): # pylint:disable=unused-argument
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# Query the hosts file
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#
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# The known rdtypes are dns.rdatatype.A, dns.rdatatype.AAAA and
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# dns.rdatatype.CNAME.
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# The ``rdclass`` parameter must be dns.rdataclass.IN while the
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# ``tcp`` and ``source`` parameters are ignored.
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# Return a HostAnswer instance or raise a dns.resolver.NoAnswer
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# exception.
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now = time.time()
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hosts_file = self.hosts_file
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if self._last_load + self.interval < now:
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self._last_load = now
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hosts_file.load()
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rdclass = dns.rdataclass.IN # Always
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if isinstance(qname, string_types):
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name = qname
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qname = dns.name.from_text(qname)
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else:
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name = str(qname)
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name = name.lower()
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rrset = dns.rrset.RRset(qname, rdclass, rdtype)
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rrset.ttl = self._last_load + self.interval - now
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if rdtype == dns.rdatatype.A:
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mapping = hosts_file.v4
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kind = dns.rdtypes.IN.A.A
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elif rdtype == dns.rdatatype.AAAA:
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mapping = hosts_file.v6
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kind = dns.rdtypes.IN.AAAA.AAAA
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elif rdtype == dns.rdatatype.CNAME:
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mapping = hosts_file.aliases
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kind = lambda c, t, addr: dns.rdtypes.ANY.CNAME.CNAME(c, t, dns.name.from_text(addr))
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elif rdtype == dns.rdatatype.PTR:
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mapping = hosts_file.reverse
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kind = lambda c, t, addr: dns.rdtypes.ANY.PTR.PTR(c, t, dns.name.from_text(addr))
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addr = mapping.get(name)
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if not addr and qname.is_absolute():
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addr = mapping.get(name[:-1])
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if addr:
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rrset.add(kind(rdclass, rdtype, addr))
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return _HostsAnswer(qname, rdtype, rdclass, rrset, raise_on_no_answer)
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def getaliases(self, hostname):
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# Return a list of all the aliases of a given cname
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# Due to the way store aliases this is a bit inefficient, this
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# clearly was an afterthought. But this is only used by
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# gethostbyname_ex so it's probably fine.
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aliases = self.hosts_file.aliases
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result = []
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if hostname in aliases:
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cannon = aliases[hostname]
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else:
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cannon = hostname
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result.append(cannon)
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for alias, cname in iteritems(aliases):
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if cannon == cname:
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result.append(alias)
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result.remove(hostname)
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return result
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class _DualResolver(object):
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def __init__(self):
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self.hosts_resolver = _HostsResolver()
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self.network_resolver = resolver.get_default_resolver()
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self.network_resolver.cache = resolver.LRUCache()
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def query(self, qname, rdtype=dns.rdatatype.A, rdclass=dns.rdataclass.IN,
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tcp=False, source=None, raise_on_no_answer=True,
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_hosts_rdtypes=(dns.rdatatype.A, dns.rdatatype.AAAA, dns.rdatatype.PTR)):
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# Query the resolver, using /etc/hosts
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# Behavior:
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# 1. if hosts is enabled and contains answer, return it now
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# 2. query nameservers for qname
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if qname is None:
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qname = '0.0.0.0'
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if not isinstance(qname, string_types):
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if isinstance(qname, bytes):
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qname = qname.decode("idna")
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if isinstance(qname, string_types):
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qname = dns.name.from_text(qname, None)
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if isinstance(rdtype, string_types):
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rdtype = dns.rdatatype.from_text(rdtype)
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if rdclass == dns.rdataclass.IN and rdtype in _hosts_rdtypes:
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try:
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answer = self.hosts_resolver.query(qname, rdtype, raise_on_no_answer=False)
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except Exception: # pylint: disable=broad-except
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from gevent import get_hub
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get_hub().handle_error(self, *sys.exc_info())
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else:
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if answer.rrset:
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return answer
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return self.network_resolver.query(qname, rdtype, rdclass,
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tcp, source, raise_on_no_answer=raise_on_no_answer)
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def _family_to_rdtype(family):
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if family == socket.AF_INET:
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rdtype = dns.rdatatype.A
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elif family == socket.AF_INET6:
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rdtype = dns.rdatatype.AAAA
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else:
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raise socket.gaierror(socket.EAI_FAMILY,
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'Address family not supported')
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return rdtype
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class Resolver(AbstractResolver):
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"""
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An *experimental* resolver that uses `dnspython`_.
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This is typically slower than the default threaded resolver
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(unless there's a cache hit, in which case it can be much faster).
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It is usually much faster than the c-ares resolver. It tends to
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scale well as more concurrent resolutions are attempted.
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Under Python 2, if the ``idna`` package is installed, this
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resolver can resolve Unicode host names that the system resolver
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cannot.
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.. note::
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This **does not** use dnspython's default resolver object, or share any
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classes with ``import dns``. A separate copy of the objects is imported to
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be able to function in a non monkey-patched process. The documentation for the resolver
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object still applies.
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The resolver that we use is available as the :attr:`resolver` attribute
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of this object (typically ``gevent.get_hub().resolver.resolver``).
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.. caution::
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Many of the same caveats about DNS results apply here as are documented
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for :class:`gevent.resolver.ares.Resolver`. In addition, the handling of
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symbolic scope IDs in IPv6 addresses passed to ``getaddrinfo`` exhibits
|
||
|
|
some differences.
|
||
|
|
|
||
|
|
On PyPy, ``getnameinfo`` can produce results when CPython raises
|
||
|
|
``socket.error``, and gevent's DNSPython resolver also
|
||
|
|
raises ``socket.error``.
|
||
|
|
|
||
|
|
.. caution::
|
||
|
|
|
||
|
|
This resolver is experimental. It may be removed or modified in
|
||
|
|
the future. As always, feedback is welcome.
|
||
|
|
|
||
|
|
.. versionadded:: 1.3a2
|
||
|
|
|
||
|
|
.. versionchanged:: 20.5.0
|
||
|
|
The errors raised are now much more consistent with those
|
||
|
|
raised by the standard library resolvers.
|
||
|
|
|
||
|
|
Handling of localhost and broadcast names is now more consistent.
|
||
|
|
|
||
|
|
.. _dnspython: http://www.dnspython.org
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, hub=None): # pylint: disable=unused-argument
|
||
|
|
if resolver._resolver is None:
|
||
|
|
_resolver = resolver._resolver = _DualResolver()
|
||
|
|
if config.resolver_nameservers:
|
||
|
|
_resolver.network_resolver.nameservers[:] = config.resolver_nameservers
|
||
|
|
if config.resolver_timeout:
|
||
|
|
_resolver.network_resolver.lifetime = config.resolver_timeout
|
||
|
|
# Different hubs in different threads could be sharing the same
|
||
|
|
# resolver.
|
||
|
|
assert isinstance(resolver._resolver, _DualResolver)
|
||
|
|
self._resolver = resolver._resolver
|
||
|
|
|
||
|
|
@property
|
||
|
|
def resolver(self):
|
||
|
|
"""
|
||
|
|
The dnspython resolver object we use.
|
||
|
|
|
||
|
|
This object has several useful attributes that can be used to
|
||
|
|
adjust the behaviour of the DNS system:
|
||
|
|
|
||
|
|
* ``cache`` is a :class:`dns.resolver.LRUCache`. Its maximum size
|
||
|
|
can be configured by calling :meth:`resolver.cache.set_max_size`
|
||
|
|
* ``nameservers`` controls which nameservers to talk to
|
||
|
|
* ``lifetime`` configures a timeout for each individual query.
|
||
|
|
"""
|
||
|
|
return self._resolver.network_resolver
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
pass
|
||
|
|
|
||
|
|
def _getaliases(self, hostname, family):
|
||
|
|
if not isinstance(hostname, str):
|
||
|
|
if isinstance(hostname, bytes):
|
||
|
|
hostname = hostname.decode("idna")
|
||
|
|
aliases = self._resolver.hosts_resolver.getaliases(hostname)
|
||
|
|
net_resolver = self._resolver.network_resolver
|
||
|
|
rdtype = _family_to_rdtype(family)
|
||
|
|
while 1:
|
||
|
|
try:
|
||
|
|
ans = net_resolver.query(hostname, dns.rdatatype.CNAME, rdtype)
|
||
|
|
except (dns.resolver.NoAnswer, dns.resolver.NXDOMAIN, dns.resolver.NoNameservers):
|
||
|
|
break
|
||
|
|
except dTimeout:
|
||
|
|
break
|
||
|
|
except AttributeError as ex:
|
||
|
|
if hostname is None or isinstance(hostname, int):
|
||
|
|
raise TypeError(ex)
|
||
|
|
raise
|
||
|
|
else:
|
||
|
|
aliases.extend(str(rr.target) for rr in ans.rrset)
|
||
|
|
hostname = ans[0].target
|
||
|
|
return aliases
|
||
|
|
|
||
|
|
def _getaddrinfo(self, host_bytes, port, family, socktype, proto, flags):
|
||
|
|
# dnspython really wants the host to be in native format.
|
||
|
|
if not isinstance(host_bytes, str):
|
||
|
|
host_bytes = host_bytes.decode(self.HOSTNAME_ENCODING)
|
||
|
|
|
||
|
|
if host_bytes == 'ff02::1de:c0:face:8D':
|
||
|
|
# This is essentially a hack to make stdlib
|
||
|
|
# test_socket:GeneralModuleTests.test_getaddrinfo_ipv6_basic
|
||
|
|
# pass. They expect to get back a lowercase ``D``, but
|
||
|
|
# dnspython does not do that.
|
||
|
|
# ``test_getaddrinfo_ipv6_scopeid_symbolic`` also expect
|
||
|
|
# the scopeid to be dropped, but again, dnspython does not
|
||
|
|
# do that; we cant fix that here so we skip that test.
|
||
|
|
host_bytes = 'ff02::1de:c0:face:8d'
|
||
|
|
|
||
|
|
if family == AF_UNSPEC:
|
||
|
|
# This tends to raise in the case that a v6 address did not exist
|
||
|
|
# but a v4 does. So we break it into two parts.
|
||
|
|
|
||
|
|
# Note that if there is no ipv6 in the hosts file, but there *is*
|
||
|
|
# an ipv4, and there *is* an ipv6 in the nameservers, we will return
|
||
|
|
# both (from the first call). The system resolver on OS X only returns
|
||
|
|
# the results from the hosts file. doubleclick.com is one example.
|
||
|
|
|
||
|
|
# See also https://github.com/gevent/gevent/issues/1012
|
||
|
|
try:
|
||
|
|
return _getaddrinfo(host_bytes, port, family, socktype, proto, flags)
|
||
|
|
except gaierror:
|
||
|
|
try:
|
||
|
|
return _getaddrinfo(host_bytes, port, AF_INET6, socktype, proto, flags)
|
||
|
|
except gaierror:
|
||
|
|
return _getaddrinfo(host_bytes, port, AF_INET, socktype, proto, flags)
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
return _getaddrinfo(host_bytes, port, family, socktype, proto, flags)
|
||
|
|
except gaierror as ex:
|
||
|
|
if ex.args[0] == EAI_NONAME and family not in self._KNOWN_ADDR_FAMILIES:
|
||
|
|
# It's possible that we got sent an unsupported family. Check
|
||
|
|
# that.
|
||
|
|
ex.args = (EAI_FAMILY, self.EAI_FAMILY_MSG)
|
||
|
|
ex.errno = EAI_FAMILY
|
||
|
|
raise
|
||
|
|
|
||
|
|
def _getnameinfo(self, address_bytes, port, sockaddr, flags):
|
||
|
|
try:
|
||
|
|
return resolver._getnameinfo(sockaddr, flags)
|
||
|
|
except error:
|
||
|
|
if not flags:
|
||
|
|
# dnspython doesn't like getting ports it can't resolve.
|
||
|
|
# We have one test, test__socket_dns.py:Test_getnameinfo_geventorg.test_port_zero
|
||
|
|
# that does this. We conservatively fix it here; this could be expanded later.
|
||
|
|
return resolver._getnameinfo(sockaddr, NI_NUMERICSERV)
|
||
|
|
|
||
|
|
def _gethostbyaddr(self, ip_address_bytes):
|
||
|
|
try:
|
||
|
|
return resolver._gethostbyaddr(ip_address_bytes)
|
||
|
|
except gaierror as ex:
|
||
|
|
if ex.args[0] == EAI_NONAME:
|
||
|
|
# Note: The system doesn't *always* raise herror;
|
||
|
|
# sometimes the original gaierror propagates through.
|
||
|
|
# It's impossible to say ahead of time or just based
|
||
|
|
# on the name which it should be. The herror seems to
|
||
|
|
# be by far the most common, though.
|
||
|
|
raise herror(1, "Unknown host")
|
||
|
|
raise
|
||
|
|
|
||
|
|
# Things that need proper error handling
|
||
|
|
getnameinfo = AbstractResolver.fixup_gaierror(AbstractResolver.getnameinfo)
|
||
|
|
gethostbyaddr = AbstractResolver.fixup_gaierror(AbstractResolver.gethostbyaddr)
|
||
|
|
gethostbyname_ex = AbstractResolver.fixup_gaierror(AbstractResolver.gethostbyname_ex)
|
||
|
|
getaddrinfo = AbstractResolver.fixup_gaierror(AbstractResolver.getaddrinfo)
|