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/lib64/python2.7/site-packages/dns/

38.135.39.45

[ NAME ]	[ SIZE ]	[ PERM ]	[ DATE ]	[ ACT ]
+FILE +DIR
rdtypes	dir	drwxr-xr-x	2024-09-19 01:16	R D
__init__.py	1.296 KB	-rw-r--r--	2011-07-09 14:05	R E G D
__init__.pyc	0.747 KB	-rw-r--r--	2022-08-18 22:54	R E G D
__init__.pyo	0.747 KB	-rw-r--r--	2022-08-18 22:54	R E G D
dnssec.py	14.373 KB	-rw-r--r--	2014-05-31 18:00	R E G D
dnssec.pyc	13.461 KB	-rw-r--r--	2022-08-18 22:54	R E G D
dnssec.pyo	13.376 KB	-rw-r--r--	2022-08-18 22:54	R E G D
e164.py	3.011 KB	-rw-r--r--	2012-04-08 12:58	R E G D
e164.pyc	2.758 KB	-rw-r--r--	2022-08-18 22:54	R E G D
e164.pyo	2.758 KB	-rw-r--r--	2022-08-18 22:54	R E G D
edns.py	4.215 KB	-rw-r--r--	2012-05-21 17:33	R E G D
edns.pyc	5.195 KB	-rw-r--r--	2022-08-18 22:54	R E G D
edns.pyo	5.195 KB	-rw-r--r--	2022-08-18 22:54	R E G D
entropy.py	3.787 KB	-rw-r--r--	2011-07-09 14:05	R E G D
entropy.pyc	3.701 KB	-rw-r--r--	2022-08-18 22:54	R E G D
entropy.pyo	3.701 KB	-rw-r--r--	2022-08-18 22:54	R E G D
exception.py	1.287 KB	-rw-r--r--	2011-07-09 14:05	R E G D
exception.pyc	1.56 KB	-rw-r--r--	2022-08-18 22:54	R E G D
exception.pyo	1.56 KB	-rw-r--r--	2022-08-18 22:54	R E G D
flags.py	2.623 KB	-rw-r--r--	2011-07-09 14:05	R E G D
flags.pyc	2.582 KB	-rw-r--r--	2022-08-18 22:54	R E G D
flags.pyo	2.582 KB	-rw-r--r--	2022-08-18 22:54	R E G D
grange.py	1.83 KB	-rw-r--r--	2013-07-07 11:18	R E G D
grange.pyc	1.152 KB	-rw-r--r--	2022-08-18 22:54	R E G D
grange.pyo	1.075 KB	-rw-r--r--	2022-08-18 22:54	R E G D
hash.py	2.339 KB	-rw-r--r--	2011-07-09 14:05	R E G D
hash.pyc	2.107 KB	-rw-r--r--	2022-08-18 22:54	R E G D
hash.pyo	2.107 KB	-rw-r--r--	2022-08-18 22:54	R E G D
inet.py	3.159 KB	-rw-r--r--	2011-07-09 14:05	R E G D
inet.pyc	2.611 KB	-rw-r--r--	2022-08-18 22:54	R E G D
inet.pyo	2.611 KB	-rw-r--r--	2022-08-18 22:54	R E G D
ipv4.py	1.809 KB	-rw-r--r--	2012-04-08 13:19	R E G D
ipv4.pyc	1.367 KB	-rw-r--r--	2022-08-18 22:54	R E G D
ipv4.pyo	1.367 KB	-rw-r--r--	2022-08-18 22:54	R E G D
ipv6.py	4.971 KB	-rw-r--r--	2014-05-31 18:10	R E G D
ipv6.pyc	3.438 KB	-rw-r--r--	2022-08-18 22:54	R E G D
ipv6.pyo	3.438 KB	-rw-r--r--	2022-08-18 22:54	R E G D
message.py	41.626 KB	-rw-r--r--	2014-04-04 12:36	R E G D
message.pyc	36.394 KB	-rw-r--r--	2022-08-18 22:54	R E G D
message.pyo	36.394 KB	-rw-r--r--	2022-08-18 22:54	R E G D
name.py	21.818 KB	-rw-r--r--	2014-06-19 12:35	R E G D
name.pyc	23.005 KB	-rw-r--r--	2022-08-18 22:54	R E G D
name.pyo	23.005 KB	-rw-r--r--	2022-08-18 22:54	R E G D
namedict.py	2.057 KB	-rw-r--r--	2011-07-09 14:05	R E G D
namedict.pyc	1.924 KB	-rw-r--r--	2022-08-18 22:54	R E G D
namedict.pyo	1.924 KB	-rw-r--r--	2022-08-18 22:54	R E G D
node.py	5.887 KB	-rw-r--r--	2013-02-26 16:44	R E G D
node.pyc	6.153 KB	-rw-r--r--	2022-08-18 22:54	R E G D
node.pyo	6.153 KB	-rw-r--r--	2022-08-18 22:54	R E G D
opcode.py	2.553 KB	-rw-r--r--	2011-07-09 14:05	R E G D
opcode.pyc	2.488 KB	-rw-r--r--	2022-08-18 22:54	R E G D
opcode.pyo	2.488 KB	-rw-r--r--	2022-08-18 22:54	R E G D
query.py	17.886 KB	-rw-r--r--	2014-06-21 15:33	R E G D
query.pyc	15.312 KB	-rw-r--r--	2022-08-18 22:54	R E G D
query.pyo	15.312 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rcode.py	3.032 KB	-rw-r--r--	2011-07-09 14:05	R E G D
rcode.pyc	2.92 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rcode.pyo	2.92 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdata.py	15.345 KB	-rw-r--r--	2011-07-18 22:04	R E G D
rdata.pyc	16.592 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdata.pyo	16.592 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdataclass.py	3.225 KB	-rw-r--r--	2011-07-09 14:05	R E G D
rdataclass.pyc	2.955 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdataclass.pyo	2.955 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdataset.py	11.277 KB	-rw-r--r--	2012-04-07 20:38	R E G D
rdataset.pyc	11.075 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdataset.pyo	11.028 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdatatype.py	5.07 KB	-rw-r--r--	2012-09-25 16:35	R E G D
rdatatype.pyc	5.291 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rdatatype.pyo	5.291 KB	-rw-r--r--	2022-08-18 22:54	R E G D
renderer.py	11.63 KB	-rw-r--r--	2013-05-30 09:27	R E G D
renderer.pyc	10.853 KB	-rw-r--r--	2022-08-18 22:54	R E G D
renderer.pyo	10.749 KB	-rw-r--r--	2022-08-18 22:54	R E G D
resolver.py	45.347 KB	-rw-r--r--	2014-06-21 16:12	R E G D
resolver.pyc	37.158 KB	-rw-r--r--	2022-08-18 22:54	R E G D
resolver.pyo	37.158 KB	-rw-r--r--	2022-08-18 22:54	R E G D
reversename.py	3.03 KB	-rw-r--r--	2014-05-31 18:10	R E G D
reversename.pyc	2.397 KB	-rw-r--r--	2022-08-18 22:54	R E G D
reversename.pyo	2.397 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rrset.py	5.757 KB	-rw-r--r--	2011-07-09 14:05	R E G D
rrset.pyc	6.165 KB	-rw-r--r--	2022-08-18 22:54	R E G D
rrset.pyo	6.165 KB	-rw-r--r--	2022-08-18 22:54	R E G D
set.py	7.658 KB	-rw-r--r--	2011-07-09 14:05	R E G D
set.pyc	9.807 KB	-rw-r--r--	2022-08-18 22:54	R E G D
set.pyo	9.807 KB	-rw-r--r--	2022-08-18 22:54	R E G D
tokenizer.py	17.542 KB	-rw-r--r--	2014-04-11 14:55	R E G D
tokenizer.pyc	16.924 KB	-rw-r--r--	2022-08-18 22:54	R E G D
tokenizer.pyo	16.924 KB	-rw-r--r--	2022-08-18 22:54	R E G D
tsig.py	8.1 KB	-rw-r--r--	2014-04-04 12:36	R E G D
tsig.pyc	8.084 KB	-rw-r--r--	2022-08-18 22:54	R E G D
tsig.pyo	8.084 KB	-rw-r--r--	2022-08-18 22:54	R E G D
tsigkeyring.py	1.61 KB	-rw-r--r--	2013-09-01 23:11	R E G D
tsigkeyring.pyc	1.164 KB	-rw-r--r--	2022-08-18 22:54	R E G D
tsigkeyring.pyo	1.164 KB	-rw-r--r--	2022-08-18 22:54	R E G D
ttl.py	2.128 KB	-rw-r--r--	2011-07-09 14:05	R E G D
ttl.pyc	1.48 KB	-rw-r--r--	2022-08-18 22:54	R E G D
ttl.pyo	1.48 KB	-rw-r--r--	2022-08-18 22:54	R E G D
update.py	9.925 KB	-rw-r--r--	2011-07-09 14:05	R E G D
update.pyc	8.267 KB	-rw-r--r--	2022-08-18 22:54	R E G D
update.pyo	8.267 KB	-rw-r--r--	2022-08-18 22:54	R E G D
version.py	1.237 KB	-rw-r--r--	2014-09-01 12:42	R E G D
version.pyc	0.547 KB	-rw-r--r--	2022-08-18 22:54	R E G D
version.pyo	0.547 KB	-rw-r--r--	2022-08-18 22:54	R E G D
wiredata.py	2.528 KB	-rw-r--r--	2014-07-24 14:35	R E G D
wiredata.pyc	2.194 KB	-rw-r--r--	2022-08-18 22:54	R E G D
wiredata.pyo	2.194 KB	-rw-r--r--	2022-08-18 22:54	R E G D
zone.py	37.941 KB	-rw-r--r--	2014-06-21 15:57	R E G D
zone.pyc	33.522 KB	-rw-r--r--	2022-08-18 22:54	R E G D
zone.pyo	33.522 KB	-rw-r--r--	2022-08-18 22:54	R E G D
REQUEST EXIT

# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """DNS stub resolver. @var default_resolver: The default resolver object @type default_resolver: dns.resolver.Resolver object""" import socket import sys import time import random try: import threading as _threading except ImportError: import dummy_threading as _threading import dns.exception import dns.flags import dns.ipv4 import dns.ipv6 import dns.message import dns.name import dns.query import dns.rcode import dns.rdataclass import dns.rdatatype import dns.reversename if sys.platform == 'win32': import _winreg class NXDOMAIN(dns.exception.DNSException): """The query name does not exist.""" pass class YXDOMAIN(dns.exception.DNSException): """The query name is too long after DNAME substitution.""" pass # The definition of the Timeout exception has moved from here to the # dns.exception module. We keep dns.resolver.Timeout defined for # backwards compatibility. Timeout = dns.exception.Timeout class NoAnswer(dns.exception.DNSException): """The response did not contain an answer to the question.""" pass class NoNameservers(dns.exception.DNSException): """No non-broken nameservers are available to answer the query.""" pass class NotAbsolute(dns.exception.DNSException): """Raised if an absolute domain name is required but a relative name was provided.""" pass class NoRootSOA(dns.exception.DNSException): """Raised if for some reason there is no SOA at the root name. This should never happen!""" pass class NoMetaqueries(dns.exception.DNSException): """Metaqueries are not allowed.""" pass class Answer(object): """DNS stub resolver answer Instances of this class bundle up the result of a successful DNS resolution. For convenience, the answer object implements much of the sequence protocol, forwarding to its rrset. E.g. "for a in answer" is equivalent to "for a in answer.rrset", "answer[i]" is equivalent to "answer.rrset[i]", and "answer[i:j]" is equivalent to "answer.rrset[i:j]". Note that CNAMEs or DNAMEs in the response may mean that answer node's name might not be the query name. @ivar qname: The query name @type qname: dns.name.Name object @ivar rdtype: The query type @type rdtype: int @ivar rdclass: The query class @type rdclass: int @ivar response: The response message @type response: dns.message.Message object @ivar rrset: The answer @type rrset: dns.rrset.RRset object @ivar expiration: The time when the answer expires @type expiration: float (seconds since the epoch) @ivar canonical_name: The canonical name of the query name @type canonical_name: dns.name.Name object """ def __init__(self, qname, rdtype, rdclass, response, raise_on_no_answer=True): self.qname = qname self.rdtype = rdtype self.rdclass = rdclass self.response = response min_ttl = -1 rrset = None for count in xrange(0, 15): try: rrset = response.find_rrset(response.answer, qname, rdclass, rdtype) if min_ttl == -1 or rrset.ttl < min_ttl: min_ttl = rrset.ttl break except KeyError: if rdtype != dns.rdatatype.CNAME: try: crrset = response.find_rrset(response.answer, qname, rdclass, dns.rdatatype.CNAME) if min_ttl == -1 or crrset.ttl < min_ttl: min_ttl = crrset.ttl for rd in crrset: qname = rd.target break continue except KeyError: if raise_on_no_answer: raise NoAnswer if raise_on_no_answer: raise NoAnswer if rrset is None and raise_on_no_answer: raise NoAnswer self.canonical_name = qname self.rrset = rrset if rrset is None: while 1: # Look for a SOA RR whose owner name is a superdomain # of qname. try: srrset = response.find_rrset(response.authority, qname, rdclass, dns.rdatatype.SOA) if min_ttl == -1 or srrset.ttl < min_ttl: min_ttl = srrset.ttl if srrset[0].minimum < min_ttl: min_ttl = srrset[0].minimum break except KeyError: try: qname = qname.parent() except dns.name.NoParent: break self.expiration = time.time() + min_ttl def __getattr__(self, attr): if attr == 'name': return self.rrset.name elif attr == 'ttl': return self.rrset.ttl elif attr == 'covers': return self.rrset.covers elif attr == 'rdclass': return self.rrset.rdclass elif attr == 'rdtype': return self.rrset.rdtype else: raise AttributeError(attr) def __len__(self): return len(self.rrset) def __iter__(self): return iter(self.rrset) def __getitem__(self, i): return self.rrset[i] def __delitem__(self, i): del self.rrset[i] def __getslice__(self, i, j): return self.rrset[i:j] def __delslice__(self, i, j): del self.rrset[i:j] class Cache(object): """Simple DNS answer cache. @ivar data: A dictionary of cached data @type data: dict @ivar cleaning_interval: The number of seconds between cleanings. The default is 300 (5 minutes). @type cleaning_interval: float @ivar next_cleaning: The time the cache should next be cleaned (in seconds since the epoch.) @type next_cleaning: float """ def __init__(self, cleaning_interval=300.0): """Initialize a DNS cache. @param cleaning_interval: the number of seconds between periodic cleanings. The default is 300.0 @type cleaning_interval: float. """ self.data = {} self.cleaning_interval = cleaning_interval self.next_cleaning = time.time() + self.cleaning_interval self.lock = _threading.Lock() def _maybe_clean(self): """Clean the cache if it's time to do so.""" now = time.time() if self.next_cleaning <= now: keys_to_delete = [] for (k, v) in self.data.iteritems(): if v.expiration <= now: keys_to_delete.append(k) for k in keys_to_delete: del self.data[k] now = time.time() self.next_cleaning = now + self.cleaning_interval def get(self, key): """Get the answer associated with I{key}. Returns None if no answer is cached for the key. @param key: the key @type key: (dns.name.Name, int, int) tuple whose values are the query name, rdtype, and rdclass. @rtype: dns.resolver.Answer object or None """ try: self.lock.acquire() self._maybe_clean() v = self.data.get(key) if v is None or v.expiration <= time.time(): return None return v finally: self.lock.release() def put(self, key, value): """Associate key and value in the cache. @param key: the key @type key: (dns.name.Name, int, int) tuple whose values are the query name, rdtype, and rdclass. @param value: The answer being cached @type value: dns.resolver.Answer object """ try: self.lock.acquire() self._maybe_clean() self.data[key] = value finally: self.lock.release() def flush(self, key=None): """Flush the cache. If I{key} is specified, only that item is flushed. Otherwise the entire cache is flushed. @param key: the key to flush @type key: (dns.name.Name, int, int) tuple or None """ try: self.lock.acquire() if not key is None: if self.data.has_key(key): del self.data[key] else: self.data = {} self.next_cleaning = time.time() + self.cleaning_interval finally: self.lock.release() class LRUCacheNode(object): """LRUCache node. """ def __init__(self, key, value): self.key = key self.value = value self.prev = self self.next = self def link_before(self, node): self.prev = node.prev self.next = node node.prev.next = self node.prev = self def link_after(self, node): self.prev = node self.next = node.next node.next.prev = self node.next = self def unlink(self): self.next.prev = self.prev self.prev.next = self.next class LRUCache(object): """Bounded least-recently-used DNS answer cache. This cache is better than the simple cache (above) if you're running a web crawler or other process that does a lot of resolutions. The LRUCache has a maximum number of nodes, and when it is full, the least-recently used node is removed to make space for a new one. @ivar data: A dictionary of cached data @type data: dict @ivar sentinel: sentinel node for circular doubly linked list of nodes @type sentinel: LRUCacheNode object @ivar max_size: The maximum number of nodes @type max_size: int """ def __init__(self, max_size=100000): """Initialize a DNS cache. @param max_size: The maximum number of nodes to cache; the default is 100000. Must be > 1. @type max_size: int """ self.data = {} self.set_max_size(max_size) self.sentinel = LRUCacheNode(None, None) self.lock = _threading.Lock() def set_max_size(self, max_size): if max_size < 1: max_size = 1 self.max_size = max_size def get(self, key): """Get the answer associated with I{key}. Returns None if no answer is cached for the key. @param key: the key @type key: (dns.name.Name, int, int) tuple whose values are the query name, rdtype, and rdclass. @rtype: dns.resolver.Answer object or None """ try: self.lock.acquire() node = self.data.get(key) if node is None: return None # Unlink because we're either going to move the node to the front # of the LRU list or we're going to free it. node.unlink() if node.value.expiration <= time.time(): del self.data[node.key] return None node.link_after(self.sentinel) return node.value finally: self.lock.release() def put(self, key, value): """Associate key and value in the cache. @param key: the key @type key: (dns.name.Name, int, int) tuple whose values are the query name, rdtype, and rdclass. @param value: The answer being cached @type value: dns.resolver.Answer object """ try: self.lock.acquire() node = self.data.get(key) if not node is None: node.unlink() del self.data[node.key] while len(self.data) >= self.max_size: node = self.sentinel.prev node.unlink() del self.data[node.key] node = LRUCacheNode(key, value) node.link_after(self.sentinel) self.data[key] = node finally: self.lock.release() def flush(self, key=None): """Flush the cache. If I{key} is specified, only that item is flushed. Otherwise the entire cache is flushed. @param key: the key to flush @type key: (dns.name.Name, int, int) tuple or None """ try: self.lock.acquire() if not key is None: node = self.data.get(key) if not node is None: node.unlink() del self.data[node.key] else: node = self.sentinel.next while node != self.sentinel: next = node.next node.prev = None node.next = None node = next self.data = {} finally: self.lock.release() class Resolver(object): """DNS stub resolver @ivar domain: The domain of this host @type domain: dns.name.Name object @ivar nameservers: A list of nameservers to query. Each nameserver is a string which contains the IP address of a nameserver. @type nameservers: list of strings @ivar search: The search list. If the query name is a relative name, the resolver will construct an absolute query name by appending the search names one by one to the query name. @type search: list of dns.name.Name objects @ivar port: The port to which to send queries. The default is 53. @type port: int @ivar timeout: The number of seconds to wait for a response from a server, before timing out. @type timeout: float @ivar lifetime: The total number of seconds to spend trying to get an answer to the question. If the lifetime expires, a Timeout exception will occur. @type lifetime: float @ivar keyring: The TSIG keyring to use. The default is None. @type keyring: dict @ivar keyname: The TSIG keyname to use. The default is None. @type keyname: dns.name.Name object @ivar keyalgorithm: The TSIG key algorithm to use. The default is dns.tsig.default_algorithm. @type keyalgorithm: string @ivar edns: The EDNS level to use. The default is -1, no Edns. @type edns: int @ivar ednsflags: The EDNS flags @type ednsflags: int @ivar payload: The EDNS payload size. The default is 0. @type payload: int @ivar flags: The message flags to use. The default is None (i.e. not overwritten) @type flags: int @ivar cache: The cache to use. The default is None. @type cache: dns.resolver.Cache object @ivar retry_servfail: should we retry a nameserver if it says SERVFAIL? The default is 'false'. @type retry_servfail: bool """ def __init__(self, filename='/etc/resolv.conf', configure=True): """Initialize a resolver instance. @param filename: The filename of a configuration file in standard /etc/resolv.conf format. This parameter is meaningful only when I{configure} is true and the platform is POSIX. @type filename: string or file object @param configure: If True (the default), the resolver instance is configured in the normal fashion for the operating system the resolver is running on. (I.e. a /etc/resolv.conf file on POSIX systems and from the registry on Windows systems.) @type configure: bool""" self.reset() if configure: if sys.platform == 'win32': self.read_registry() elif filename: self.read_resolv_conf(filename) def reset(self): """Reset all resolver configuration to the defaults.""" self.domain = \ dns.name.Name(dns.name.from_text(socket.gethostname())[1:]) if len(self.domain) == 0: self.domain = dns.name.root self.nameservers = [] self.search = [] self.port = 53 self.timeout = 2.0 self.lifetime = 30.0 self.keyring = None self.keyname = None self.keyalgorithm = dns.tsig.default_algorithm self.edns = -1 self.ednsflags = 0 self.payload = 0 self.cache = None self.flags = None self.retry_servfail = False self.rotate = False def read_resolv_conf(self, f): """Process f as a file in the /etc/resolv.conf format. If f is a string, it is used as the name of the file to open; otherwise it is treated as the file itself.""" if isinstance(f, str) or isinstance(f, unicode): try: f = open(f, 'r') except IOError: # /etc/resolv.conf doesn't exist, can't be read, etc. # We'll just use the default resolver configuration. self.nameservers = ['127.0.0.1'] return want_close = True else: want_close = False try: for l in f: if len(l) == 0 or l[0] == '#' or l[0] == ';': continue tokens = l.split() if len(tokens) == 0: continue if tokens[0] == 'nameserver': self.nameservers.append(tokens[1]) elif tokens[0] == 'domain': self.domain = dns.name.from_text(tokens[1]) elif tokens[0] == 'search': for suffix in tokens[1:]: self.search.append(dns.name.from_text(suffix)) elif tokens[0] == 'options': if 'rotate' in tokens[1:]: self.rotate = True finally: if want_close: f.close() if len(self.nameservers) == 0: self.nameservers.append('127.0.0.1') def _determine_split_char(self, entry): # # The windows registry irritatingly changes the list element # delimiter in between ' ' and ',' (and vice-versa) in various # versions of windows. # if entry.find(' ') >= 0: split_char = ' ' elif entry.find(',') >= 0: split_char = ',' else: # probably a singleton; treat as a space-separated list. split_char = ' ' return split_char def _config_win32_nameservers(self, nameservers): """Configure a NameServer registry entry.""" # we call str() on nameservers to convert it from unicode to ascii nameservers = str(nameservers) split_char = self._determine_split_char(nameservers) ns_list = nameservers.split(split_char) for ns in ns_list: if not ns in self.nameservers: self.nameservers.append(ns) def _config_win32_domain(self, domain): """Configure a Domain registry entry.""" # we call str() on domain to convert it from unicode to ascii self.domain = dns.name.from_text(str(domain)) def _config_win32_search(self, search): """Configure a Search registry entry.""" # we call str() on search to convert it from unicode to ascii search = str(search) split_char = self._determine_split_char(search) search_list = search.split(split_char) for s in search_list: if not s in self.search: self.search.append(dns.name.from_text(s)) def _config_win32_fromkey(self, key): """Extract DNS info from a registry key.""" try: servers, rtype = _winreg.QueryValueEx(key, 'NameServer') except WindowsError: servers = None if servers: self._config_win32_nameservers(servers) try: dom, rtype = _winreg.QueryValueEx(key, 'Domain') if dom: self._config_win32_domain(dom) except WindowsError: pass else: try: servers, rtype = _winreg.QueryValueEx(key, 'DhcpNameServer') except WindowsError: servers = None if servers: self._config_win32_nameservers(servers) try: dom, rtype = _winreg.QueryValueEx(key, 'DhcpDomain') if dom: self._config_win32_domain(dom) except WindowsError: pass try: search, rtype = _winreg.QueryValueEx(key, 'SearchList') except WindowsError: search = None if search: self._config_win32_search(search) def read_registry(self): """Extract resolver configuration from the Windows registry.""" lm = _winreg.ConnectRegistry(None, _winreg.HKEY_LOCAL_MACHINE) want_scan = False try: try: # XP, 2000 tcp_params = _winreg.OpenKey(lm, r'SYSTEM\CurrentControlSet' r'\Services\Tcpip\Parameters') want_scan = True except EnvironmentError: # ME tcp_params = _winreg.OpenKey(lm, r'SYSTEM\CurrentControlSet' r'\Services\VxD\MSTCP') try: self._config_win32_fromkey(tcp_params) finally: tcp_params.Close() if want_scan: interfaces = _winreg.OpenKey(lm, r'SYSTEM\CurrentControlSet' r'\Services\Tcpip\Parameters' r'\Interfaces') try: i = 0 while True: try: guid = _winreg.EnumKey(interfaces, i) i += 1 key = _winreg.OpenKey(interfaces, guid) if not self._win32_is_nic_enabled(lm, guid, key): continue try: self._config_win32_fromkey(key) finally: key.Close() except EnvironmentError: break finally: interfaces.Close() finally: lm.Close() def _win32_is_nic_enabled(self, lm, guid, interface_key): # Look in the Windows Registry to determine whether the network # interface corresponding to the given guid is enabled. # # (Code contributed by Paul Marks, thanks!) # try: # This hard-coded location seems to be consistent, at least # from Windows 2000 through Vista. connection_key = _winreg.OpenKey( lm, r'SYSTEM\CurrentControlSet\Control\Network' r'\{4D36E972-E325-11CE-BFC1-08002BE10318}' r'\%s\Connection' % guid) try: # The PnpInstanceID points to a key inside Enum (pnp_id, ttype) = _winreg.QueryValueEx( connection_key, 'PnpInstanceID') if ttype != _winreg.REG_SZ: raise ValueError device_key = _winreg.OpenKey( lm, r'SYSTEM\CurrentControlSet\Enum\%s' % pnp_id) try: # Get ConfigFlags for this device (flags, ttype) = _winreg.QueryValueEx( device_key, 'ConfigFlags') if ttype != _winreg.REG_DWORD: raise ValueError # Based on experimentation, bit 0x1 indicates that the # device is disabled. return not (flags & 0x1) finally: device_key.Close() finally: connection_key.Close() except (EnvironmentError, ValueError): # Pre-vista, enabled interfaces seem to have a non-empty # NTEContextList; this was how dnspython detected enabled # nics before the code above was contributed. We've retained # the old method since we don't know if the code above works # on Windows 95/98/ME. try: (nte, ttype) = _winreg.QueryValueEx(interface_key, 'NTEContextList') return nte is not None except WindowsError: return False def _compute_timeout(self, start): now = time.time() if now < start: if start - now > 1: # Time going backwards is bad. Just give up. raise Timeout else: # Time went backwards, but only a little. This can # happen, e.g. under vmware with older linux kernels. # Pretend it didn't happen. now = start duration = now - start if duration >= self.lifetime: raise Timeout return min(self.lifetime - duration, self.timeout) def query(self, qname, rdtype=dns.rdatatype.A, rdclass=dns.rdataclass.IN, tcp=False, source=None, raise_on_no_answer=True, source_port=0): """Query nameservers to find the answer to the question. The I{qname}, I{rdtype}, and I{rdclass} parameters may be objects of the appropriate type, or strings that can be converted into objects of the appropriate type. E.g. For I{rdtype} the integer 2 and the the string 'NS' both mean to query for records with DNS rdata type NS. @param qname: the query name @type qname: dns.name.Name object or string @param rdtype: the query type @type rdtype: int or string @param rdclass: the query class @type rdclass: int or string @param tcp: use TCP to make the query (default is False). @type tcp: bool @param source: bind to this IP address (defaults to machine default IP). @type source: IP address in dotted quad notation @param raise_on_no_answer: raise NoAnswer if there's no answer (defaults is True). @type raise_on_no_answer: bool @param source_port: The port from which to send the message. The default is 0. @type source_port: int @rtype: dns.resolver.Answer instance @raises Timeout: no answers could be found in the specified lifetime @raises NXDOMAIN: the query name does not exist @raises YXDOMAIN: the query name is too long after DNAME substitution @raises NoAnswer: the response did not contain an answer and raise_on_no_answer is True. @raises NoNameservers: no non-broken nameservers are available to answer the question.""" if isinstance(qname, (str, unicode)): qname = dns.name.from_text(qname, None) if isinstance(rdtype, (str, unicode)): rdtype = dns.rdatatype.from_text(rdtype) if dns.rdatatype.is_metatype(rdtype): raise NoMetaqueries if isinstance(rdclass, (str, unicode)): rdclass = dns.rdataclass.from_text(rdclass) if dns.rdataclass.is_metaclass(rdclass): raise NoMetaqueries qnames_to_try = [] if qname.is_absolute(): qnames_to_try.append(qname) else: if len(qname) > 1: qnames_to_try.append(qname.concatenate(dns.name.root)) if self.search: for suffix in self.search: qnames_to_try.append(qname.concatenate(suffix)) else: qnames_to_try.append(qname.concatenate(self.domain)) all_nxdomain = True start = time.time() for qname in qnames_to_try: if self.cache: answer = self.cache.get((qname, rdtype, rdclass)) if not answer is None: if answer.rrset is None and raise_on_no_answer: raise NoAnswer else: return answer request = dns.message.make_query(qname, rdtype, rdclass) if not self.keyname is None: request.use_tsig(self.keyring, self.keyname, algorithm=self.keyalgorithm) request.use_edns(self.edns, self.ednsflags, self.payload) if self.flags is not None: request.flags = self.flags response = None # # make a copy of the servers list so we can alter it later. # nameservers = self.nameservers[:] if self.rotate: random.shuffle(nameservers) backoff = 0.10 while response is None: if len(nameservers) == 0: raise NoNameservers for nameserver in nameservers[:]: timeout = self._compute_timeout(start) try: if tcp: response = dns.query.tcp(request, nameserver, timeout, self.port, source=source, source_port=source_port) else: response = dns.query.udp(request, nameserver, timeout, self.port, source=source, source_port=source_port) if response.flags & dns.flags.TC: # Response truncated; retry with TCP. timeout = self._compute_timeout(start) response = dns.query.tcp(request, nameserver, timeout, self.port, source=source, source_port=source_port) except (socket.error, dns.exception.Timeout): # # Communication failure or timeout. Go to the # next server # response = None continue except dns.query.UnexpectedSource: # # Who knows? Keep going. # response = None continue except dns.exception.FormError: # # We don't understand what this server is # saying. Take it out of the mix and # continue. # nameservers.remove(nameserver) response = None continue except EOFError: # # We're using TCP and they hung up on us. # Probably they don't support TCP (though # they're supposed to!). Take it out of the # mix and continue. # nameservers.remove(nameserver) response = None continue rcode = response.rcode() if rcode == dns.rcode.YXDOMAIN: raise YXDOMAIN if rcode == dns.rcode.NOERROR or \ rcode == dns.rcode.NXDOMAIN: break # # We got a response, but we're not happy with the # rcode in it. Remove the server from the mix if # the rcode isn't SERVFAIL. # if rcode != dns.rcode.SERVFAIL or not self.retry_servfail: nameservers.remove(nameserver) response = None if not response is None: break # # All nameservers failed! # if len(nameservers) > 0: # # But we still have servers to try. Sleep a bit # so we don't pound them! # timeout = self._compute_timeout(start) sleep_time = min(timeout, backoff) backoff *= 2 time.sleep(sleep_time) if response.rcode() == dns.rcode.NXDOMAIN: continue all_nxdomain = False break if all_nxdomain: raise NXDOMAIN answer = Answer(qname, rdtype, rdclass, response, raise_on_no_answer) if self.cache: self.cache.put((qname, rdtype, rdclass), answer) return answer def use_tsig(self, keyring, keyname=None, algorithm=dns.tsig.default_algorithm): """Add a TSIG signature to the query. @param keyring: The TSIG keyring to use; defaults to None. @type keyring: dict @param keyname: The name of the TSIG key to use; defaults to None. The key must be defined in the keyring. If a keyring is specified but a keyname is not, then the key used will be the first key in the keyring. Note that the order of keys in a dictionary is not defined, so applications should supply a keyname when a keyring is used, unless they know the keyring contains only one key. @param algorithm: The TSIG key algorithm to use. The default is dns.tsig.default_algorithm. @type algorithm: string""" self.keyring = keyring if keyname is None: self.keyname = self.keyring.keys()[0] else: self.keyname = keyname self.keyalgorithm = algorithm def use_edns(self, edns, ednsflags, payload): """Configure Edns. @param edns: The EDNS level to use. The default is -1, no Edns. @type edns: int @param ednsflags: The EDNS flags @type ednsflags: int @param payload: The EDNS payload size. The default is 0. @type payload: int""" if edns is None: edns = -1 self.edns = edns self.ednsflags = ednsflags self.payload = payload def set_flags(self, flags): """Overrides the default flags with your own @param flags: The flags to overwrite the default with @type flags: int""" self.flags = flags default_resolver = None def get_default_resolver(): """Get the default resolver, initializing it if necessary.""" global default_resolver if default_resolver is None: default_resolver = Resolver() return default_resolver def query(qname, rdtype=dns.rdatatype.A, rdclass=dns.rdataclass.IN, tcp=False, source=None, raise_on_no_answer=True, source_port=0): """Query nameservers to find the answer to the question. This is a convenience function that uses the default resolver object to make the query. @see: L{dns.resolver.Resolver.query} for more information on the parameters.""" return get_default_resolver().query(qname, rdtype, rdclass, tcp, source, raise_on_no_answer, source_port) def zone_for_name(name, rdclass=dns.rdataclass.IN, tcp=False, resolver=None): """Find the name of the zone which contains the specified name. @param name: the query name @type name: absolute dns.name.Name object or string @param rdclass: The query class @type rdclass: int @param tcp: use TCP to make the query (default is False). @type tcp: bool @param resolver: the resolver to use @type resolver: dns.resolver.Resolver object or None @rtype: dns.name.Name""" if isinstance(name, (str, unicode)): name = dns.name.from_text(name, dns.name.root) if resolver is None: resolver = get_default_resolver() if not name.is_absolute(): raise NotAbsolute(name) while 1: try: answer = resolver.query(name, dns.rdatatype.SOA, rdclass, tcp) if answer.rrset.name == name: return name # otherwise we were CNAMEd or DNAMEd and need to look higher except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer): pass try: name = name.parent() except dns.name.NoParent: raise NoRootSOA # # Support for overriding the system resolver for all python code in the # running process. # _protocols_for_socktype = { socket.SOCK_DGRAM : [socket.SOL_UDP], socket.SOCK_STREAM : [socket.SOL_TCP], } _resolver = None _original_getaddrinfo = socket.getaddrinfo _original_getnameinfo = socket.getnameinfo _original_getfqdn = socket.getfqdn _original_gethostbyname = socket.gethostbyname _original_gethostbyname_ex = socket.gethostbyname_ex _original_gethostbyaddr = socket.gethostbyaddr def _getaddrinfo(host=None, service=None, family=socket.AF_UNSPEC, socktype=0, proto=0, flags=0): if flags & (socket.AI_ADDRCONFIG|socket.AI_V4MAPPED) != 0: raise NotImplementedError if host is None and service is None: raise socket.gaierror(socket.EAI_NONAME) v6addrs = [] v4addrs = [] canonical_name = None try: # Is host None or a V6 address literal? if host is None: canonical_name = 'localhost' if flags & socket.AI_PASSIVE != 0: v6addrs.append('::') v4addrs.append('0.0.0.0') else: v6addrs.append('::1') v4addrs.append('127.0.0.1') else: parts = host.split('%') if len(parts) == 2: ahost = parts[0] else: ahost = host addr = dns.ipv6.inet_aton(ahost) v6addrs.append(host) canonical_name = host except: try: # Is it a V4 address literal? addr = dns.ipv4.inet_aton(host) v4addrs.append(host) canonical_name = host except: if flags & socket.AI_NUMERICHOST == 0: try: qname = None if family == socket.AF_INET6 or family == socket.AF_UNSPEC: v6 = _resolver.query(host, dns.rdatatype.AAAA, raise_on_no_answer=False) # Note that setting host ensures we query the same name # for A as we did for AAAA. host = v6.qname canonical_name = v6.canonical_name.to_text(True) if v6.rrset is not None: for rdata in v6.rrset: v6addrs.append(rdata.address) if family == socket.AF_INET or family == socket.AF_UNSPEC: v4 = _resolver.query(host, dns.rdatatype.A, raise_on_no_answer=False) host = v4.qname canonical_name = v4.canonical_name.to_text(True) if v4.rrset is not None: for rdata in v4.rrset: v4addrs.append(rdata.address) except dns.resolver.NXDOMAIN: raise socket.gaierror(socket.EAI_NONAME) except: raise socket.gaierror(socket.EAI_SYSTEM) port = None try: # Is it a port literal? if service is None: port = 0 else: port = int(service) except: if flags & socket.AI_NUMERICSERV == 0: try: port = socket.getservbyname(service) except: pass if port is None: raise socket.gaierror(socket.EAI_NONAME) tuples = [] if socktype == 0: socktypes = [socket.SOCK_DGRAM, socket.SOCK_STREAM] else: socktypes = [socktype] if flags & socket.AI_CANONNAME != 0: cname = canonical_name else: cname = '' if family == socket.AF_INET6 or family == socket.AF_UNSPEC: for addr in v6addrs: for socktype in socktypes: for proto in _protocols_for_socktype[socktype]: tuples.append((socket.AF_INET6, socktype, proto, cname, (addr, port, 0, 0))) if family == socket.AF_INET or family == socket.AF_UNSPEC: for addr in v4addrs: for socktype in socktypes: for proto in _protocols_for_socktype[socktype]: tuples.append((socket.AF_INET, socktype, proto, cname, (addr, port))) if len(tuples) == 0: raise socket.gaierror(socket.EAI_NONAME) return tuples def _getnameinfo(sockaddr, flags=0): host = sockaddr[0] port = sockaddr[1] if len(sockaddr) == 4: scope = sockaddr[3] family = socket.AF_INET6 else: scope = None family = socket.AF_INET tuples = _getaddrinfo(host, port, family, socket.SOCK_STREAM, socket.SOL_TCP, 0) if len(tuples) > 1: raise socket.error('sockaddr resolved to multiple addresses') addr = tuples[0][4][0] if flags & socket.NI_DGRAM: pname = 'udp' else: pname = 'tcp' qname = dns.reversename.from_address(addr) if flags & socket.NI_NUMERICHOST == 0: try: answer = _resolver.query(qname, 'PTR') hostname = answer.rrset[0].target.to_text(True) except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer): if flags & socket.NI_NAMEREQD: raise socket.gaierror(socket.EAI_NONAME) hostname = addr if scope is not None: hostname += '%' + str(scope) else: hostname = addr if scope is not None: hostname += '%' + str(scope) if flags & socket.NI_NUMERICSERV: service = str(port) else: service = socket.getservbyport(port, pname) return (hostname, service) def _getfqdn(name=None): if name is None: name = socket.gethostname() return _getnameinfo(_getaddrinfo(name, 80)[0][4])[0] def _gethostbyname(name): return _gethostbyname_ex(name)[2][0] def _gethostbyname_ex(name): aliases = [] addresses = [] tuples = _getaddrinfo(name, 0, socket.AF_INET, socket.SOCK_STREAM, socket.SOL_TCP, socket.AI_CANONNAME) canonical = tuples[0][3] for item in tuples: addresses.append(item[4][0]) # XXX we just ignore aliases return (canonical, aliases, addresses) def _gethostbyaddr(ip): try: addr = dns.ipv6.inet_aton(ip) sockaddr = (ip, 80, 0, 0) family = socket.AF_INET6 except: sockaddr = (ip, 80) family = socket.AF_INET (name, port) = _getnameinfo(sockaddr, socket.NI_NAMEREQD) aliases = [] addresses = [] tuples = _getaddrinfo(name, 0, family, socket.SOCK_STREAM, socket.SOL_TCP, socket.AI_CANONNAME) canonical = tuples[0][3] for item in tuples: addresses.append(item[4][0]) # XXX we just ignore aliases return (canonical, aliases, addresses) def override_system_resolver(resolver=None): """Override the system resolver routines in the socket module with versions which use dnspython's resolver. This can be useful in testing situations where you want to control the resolution behavior of python code without having to change the system's resolver settings (e.g. /etc/resolv.conf). The resolver to use may be specified; if it's not, the default resolver will be used. @param resolver: the resolver to use @type resolver: dns.resolver.Resolver object or None """ if resolver is None: resolver = get_default_resolver() global _resolver _resolver = resolver socket.getaddrinfo = _getaddrinfo socket.getnameinfo = _getnameinfo socket.getfqdn = _getfqdn socket.gethostbyname = _gethostbyname socket.gethostbyname_ex = _gethostbyname_ex socket.gethostbyaddr = _gethostbyaddr def restore_system_resolver(): """Undo the effects of override_system_resolver(). """ global _resolver _resolver = None socket.getaddrinfo = _original_getaddrinfo socket.getnameinfo = _original_getnameinfo socket.getfqdn = _original_getfqdn socket.gethostbyname = _original_gethostbyname socket.gethostbyname_ex = _original_gethostbyname_ex socket.gethostbyaddr = _original_gethostbyaddr