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662 lines
25 KiB
662 lines
25 KiB
# 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 time
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import re
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import os
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import sys
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import _socket
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from _socket import AI_NUMERICHOST
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from _socket import error
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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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import socket
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from gevent.resolver import AbstractResolver
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from gevent.resolver import hostname_types
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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._patcher import import_patched
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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.
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def _patch_dns():
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top = import_patched('dns')
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for pkg in ('dns',
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'dns.rdtypes',
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'dns.rdtypes.IN',
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'dns.rdtypes.ANY'):
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mod = import_patched(pkg)
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for name in mod.__all__:
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setattr(mod, name, import_patched(pkg + '.' + name))
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return top
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dns = _patch_dns()
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def _dns_import_patched(name):
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assert name.startswith('dns')
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import_patched(name)
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return dns
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# This module tries to dynamically import classes
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# using __import__, and it's important that they match
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# the ones we just created, otherwise exceptions won't be caught
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# as expected. It uses a one-arg __import__ statement and then
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# tries to walk down the sub-modules using getattr, so we can't
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# directly use import_patched as-is.
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dns.rdata.__import__ = _dns_import_patched
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resolver = dns.resolver
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dTimeout = dns.resolver.Timeout
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_exc_clear = getattr(sys, 'exc_clear', lambda: None)
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# This is a copy of resolver._getaddrinfo with the crucial change that it
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# doesn't have a bare except:, because that breaks Timeout and KeyboardInterrupt
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# A secondary change is that calls to sys.exc_clear() have been inserted to avoid
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# failing tests in test__refcount.py (timeouts).
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# See https://github.com/rthalley/dnspython/pull/300
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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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# pylint:disable=too-many-locals,broad-except,too-many-statements
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# pylint:disable=too-many-branches
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# pylint:disable=redefined-argument-from-local
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# pylint:disable=consider-using-in
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if flags & (socket.AI_ADDRCONFIG | socket.AI_V4MAPPED) != 0:
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raise NotImplementedError
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if host is None and service is None:
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raise socket.gaierror(socket.EAI_NONAME)
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v6addrs = []
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v4addrs = []
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canonical_name = None
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try:
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# Is host None or a V6 address literal?
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if host is None:
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canonical_name = 'localhost'
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if flags & socket.AI_PASSIVE != 0:
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v6addrs.append('::')
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v4addrs.append('0.0.0.0')
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else:
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v6addrs.append('::1')
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v4addrs.append('127.0.0.1')
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else:
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parts = host.split('%')
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if len(parts) == 2:
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ahost = parts[0]
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else:
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ahost = host
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addr = dns.ipv6.inet_aton(ahost)
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v6addrs.append(host)
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canonical_name = host
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except Exception:
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_exc_clear()
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try:
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# Is it a V4 address literal?
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addr = dns.ipv4.inet_aton(host)
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v4addrs.append(host)
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canonical_name = host
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except Exception:
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_exc_clear()
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if flags & socket.AI_NUMERICHOST == 0:
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try:
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if family == socket.AF_INET6 or family == socket.AF_UNSPEC:
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v6 = resolver._resolver.query(host, dns.rdatatype.AAAA,
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raise_on_no_answer=False)
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# Note that setting host ensures we query the same name
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# for A as we did for AAAA.
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host = v6.qname
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canonical_name = v6.canonical_name.to_text(True)
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if v6.rrset is not None:
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for rdata in v6.rrset:
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v6addrs.append(rdata.address)
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if family == socket.AF_INET or family == socket.AF_UNSPEC:
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v4 = resolver._resolver.query(host, dns.rdatatype.A,
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raise_on_no_answer=False)
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host = v4.qname
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canonical_name = v4.canonical_name.to_text(True)
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if v4.rrset is not None:
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for rdata in v4.rrset:
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v4addrs.append(rdata.address)
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except dns.resolver.NXDOMAIN:
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_exc_clear()
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raise socket.gaierror(socket.EAI_NONAME)
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except Exception:
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_exc_clear()
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raise socket.gaierror(socket.EAI_SYSTEM)
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port = None
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try:
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# Is it a port literal?
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if service is None:
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port = 0
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else:
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port = int(service)
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except Exception:
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_exc_clear()
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if flags & socket.AI_NUMERICSERV == 0:
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try:
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port = socket.getservbyname(service)
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except Exception:
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_exc_clear()
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if port is None:
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raise socket.gaierror(socket.EAI_NONAME)
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tuples = []
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if socktype == 0:
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socktypes = [socket.SOCK_DGRAM, socket.SOCK_STREAM]
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else:
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socktypes = [socktype]
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if flags & socket.AI_CANONNAME != 0:
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cname = canonical_name
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else:
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cname = ''
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if family == socket.AF_INET6 or family == socket.AF_UNSPEC:
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for addr in v6addrs:
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for socktype in socktypes:
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for proto in resolver._protocols_for_socktype[socktype]:
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tuples.append((socket.AF_INET6, socktype, proto,
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cname, (addr, port, 0, 0))) # XXX: gevent: this can get the scopeid wrong
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if family == socket.AF_INET or family == socket.AF_UNSPEC:
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for addr in v4addrs:
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for socktype in socktypes:
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for proto in resolver._protocols_for_socktype[socktype]:
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tuples.append((socket.AF_INET, socktype, proto,
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cname, (addr, port)))
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if len(tuples) == 0: # pylint:disable=len-as-condition
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raise socket.gaierror(socket.EAI_NONAME)
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return tuples
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resolver._getaddrinfo = _getaddrinfo
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HOSTS_TTL = 300.0
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def _is_addr(host, parse=dns.ipv4.inet_aton):
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if not host:
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return False
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assert isinstance(host, hostname_types), repr(host)
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try:
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parse(host)
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except dns.exception.SyntaxError:
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return False
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else:
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return True
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# Return True if host is a valid IPv4 address
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_is_ipv4_addr = _is_addr
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def _is_ipv6_addr(host):
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# Return True if host is a valid IPv6 address
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if host:
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s = '%' if isinstance(host, str) else b'%'
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host = host.split(s, 1)[0]
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return _is_addr(host, dns.ipv6.inet_aton)
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class HostsFile(object):
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"""
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A class to read the contents of a hosts file (/etc/hosts).
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"""
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LINES_RE = re.compile(r"""
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\s* # Leading space
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([^\r\n#]+?) # The actual match, non-greedy so as not to include trailing space
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\s* # Trailing space
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(?:[#][^\r\n]+)? # Comments
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(?:$|[\r\n]+) # EOF or newline
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""", re.VERBOSE)
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def __init__(self, fname=None):
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self.v4 = {} # name -> ipv4
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self.v6 = {} # name -> ipv6
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self.aliases = {} # name -> canonical_name
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self.reverse = {} # ip addr -> some name
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if fname is None:
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if os.name == 'posix':
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fname = '/etc/hosts'
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elif os.name == 'nt': # pragma: no cover
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fname = os.path.expandvars(
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r'%SystemRoot%\system32\drivers\etc\hosts')
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self.fname = fname
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assert self.fname
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self._last_load = 0
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def _readlines(self):
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# Read the contents of the hosts file.
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#
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# Return list of lines, comment lines and empty lines are
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# excluded. Note that this performs disk I/O so can be
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# blocking.
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with open(self.fname, 'rb') as fp:
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fdata = fp.read()
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# XXX: Using default decoding. Is that correct?
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udata = fdata.decode(errors='ignore') if not isinstance(fdata, str) else fdata
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return self.LINES_RE.findall(udata)
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def load(self): # pylint:disable=too-many-locals
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# Load hosts file
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# This will (re)load the data from the hosts
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# file if it has changed.
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try:
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load_time = os.stat(self.fname).st_mtime
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needs_load = load_time > self._last_load
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except (IOError, OSError):
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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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needs_load = False
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if not needs_load:
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return
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v4 = {}
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v6 = {}
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aliases = {}
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reverse = {}
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for line in self._readlines():
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parts = line.split()
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if len(parts) < 2:
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continue
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ip = parts.pop(0)
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if _is_ipv4_addr(ip):
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ipmap = v4
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elif _is_ipv6_addr(ip):
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if ip.startswith('fe80'):
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# Do not use link-local addresses, OSX stores these here
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continue
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ipmap = v6
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else:
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continue
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cname = parts.pop(0).lower()
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ipmap[cname] = ip
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for alias in parts:
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alias = alias.lower()
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ipmap[alias] = ip
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aliases[alias] = cname
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# XXX: This is wrong for ipv6
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if ipmap is v4:
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ptr = '.'.join(reversed(ip.split('.'))) + '.in-addr.arpa'
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else:
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ptr = ip + '.ip6.arpa.'
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if ptr not in reverse:
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reverse[ptr] = cname
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self._last_load = load_time
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self.v4 = v4
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self.v6 = v6
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self.aliases = aliases
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self.reverse = reverse
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def iter_all_host_addr_pairs(self):
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self.load()
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for name, addr in iteritems(self.v4):
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yield name, addr
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for name, addr in iteritems(self.v6):
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yield name, addr
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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):
|
|
rdtype = dns.rdatatype.from_text(rdtype)
|
|
|
|
if rdclass == dns.rdataclass.IN and rdtype in _hosts_rdtypes:
|
|
try:
|
|
answer = self.hosts_resolver.query(qname, rdtype, raise_on_no_answer=False)
|
|
except Exception: # pylint: disable=broad-except
|
|
from gevent import get_hub
|
|
get_hub().handle_error(self, *sys.exc_info())
|
|
else:
|
|
if answer.rrset:
|
|
return answer
|
|
|
|
return self.network_resolver.query(qname, rdtype, rdclass,
|
|
tcp, source, raise_on_no_answer=raise_on_no_answer)
|
|
|
|
def _family_to_rdtype(family):
|
|
if family == socket.AF_INET:
|
|
rdtype = dns.rdatatype.A
|
|
elif family == socket.AF_INET6:
|
|
rdtype = dns.rdatatype.AAAA
|
|
else:
|
|
raise socket.gaierror(socket.EAI_FAMILY,
|
|
'Address family not supported')
|
|
return rdtype
|
|
|
|
class Resolver(AbstractResolver):
|
|
"""
|
|
An *experimental* resolver that uses `dnspython`_.
|
|
|
|
This is typically slower than the default threaded resolver
|
|
(unless there's a cache hit, in which case it can be much faster).
|
|
It is usually much faster than the c-ares resolver. It tends to
|
|
scale well as more concurrent resolutions are attempted.
|
|
|
|
Under Python 2, if the ``idna`` package is installed, this
|
|
resolver can resolve Unicode host names that the system resolver
|
|
cannot.
|
|
|
|
.. note::
|
|
|
|
This **does not** use dnspython's default resolver object, or share any
|
|
classes with ``import dns``. A separate copy of the objects is imported to
|
|
be able to function in a non monkey-patched process. The documentation for the resolver
|
|
object still applies.
|
|
|
|
The resolver that we use is available as the :attr:`resolver` attribute
|
|
of this object (typically ``gevent.get_hub().resolver.resolver``).
|
|
|
|
.. caution::
|
|
|
|
Many of the same caveats about DNS results apply here as are documented
|
|
for :class:`gevent.resolver.ares.Resolver`.
|
|
|
|
.. caution::
|
|
|
|
This resolver is experimental. It may be removed or modified in
|
|
the future. As always, feedback is welcome.
|
|
|
|
.. versionadded:: 1.3a2
|
|
|
|
.. _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 True:
|
|
try:
|
|
ans = net_resolver.query(hostname, dns.rdatatype.CNAME, rdtype)
|
|
except (dns.resolver.NoAnswer, dns.resolver.NXDOMAIN, dns.resolver.NoNameservers):
|
|
break
|
|
except dTimeout:
|
|
break
|
|
else:
|
|
aliases.extend(str(rr.target) for rr in ans.rrset)
|
|
hostname = ans[0].target
|
|
return aliases
|
|
|
|
def getaddrinfo(self, host, port, family=0, socktype=0, proto=0, flags=0):
|
|
if ((host in (u'localhost', b'localhost')
|
|
or (_is_ipv6_addr(host) and host.startswith('fe80')))
|
|
or not isinstance(host, str) or (flags & AI_NUMERICHOST)):
|
|
# this handles cases which do not require network access
|
|
# 1) host is None
|
|
# 2) host is of an invalid type
|
|
# 3) host is localhost or a link-local ipv6; dnspython returns the wrong
|
|
# scope-id for those.
|
|
# 3) AI_NUMERICHOST flag is set
|
|
|
|
return _socket.getaddrinfo(host, port, family, socktype, proto, flags)
|
|
|
|
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, port, family, socktype, proto, flags)
|
|
except socket.gaierror:
|
|
try:
|
|
return _getaddrinfo(host, port, AF_INET6, socktype, proto, flags)
|
|
except socket.gaierror:
|
|
return _getaddrinfo(host, port, AF_INET, socktype, proto, flags)
|
|
else:
|
|
return _getaddrinfo(host, port, family, socktype, proto, flags)
|
|
|
|
def getnameinfo(self, sockaddr, flags):
|
|
if (sockaddr
|
|
and isinstance(sockaddr, (list, tuple))
|
|
and sockaddr[0] in ('::1', '127.0.0.1', 'localhost')):
|
|
return _socket.getnameinfo(sockaddr, flags)
|
|
if isinstance(sockaddr, (list, tuple)) and not isinstance(sockaddr[0], hostname_types):
|
|
raise TypeError("getnameinfo(): illegal sockaddr argument")
|
|
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):
|
|
if ip_address in (u'127.0.0.1', u'::1',
|
|
b'127.0.0.1', b'::1',
|
|
'localhost'):
|
|
return _socket.gethostbyaddr(ip_address)
|
|
|
|
if not isinstance(ip_address, hostname_types):
|
|
raise TypeError("argument 1 must be str, bytes or bytearray, not %s" % (type(ip_address),))
|
|
|
|
return resolver._gethostbyaddr(ip_address)
|
|
|