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| 1 # -*- test-case-name: twisted.names.test.test_names -*- | |
| 2 # Copyright (c) 2001-2007 Twisted Matrix Laboratories. | |
| 3 # See LICENSE for details. | |
| 4 | |
| 5 | |
| 6 """ | |
| 7 Asynchronous client DNS | |
| 8 | |
| 9 The functions exposed in this module can be used for asynchronous name | |
| 10 resolution and dns queries. | |
| 11 | |
| 12 If you need to create a resolver with specific requirements, such as needing to | |
| 13 do queries against a particular host, the L{createResolver} function will | |
| 14 return an C{IResolver}. | |
| 15 | |
| 16 Future plans: Proper nameserver acquisition on Windows/MacOS, | |
| 17 better caching, respect timeouts | |
| 18 | |
| 19 @author: U{Jp Calderone<mailto:exarkun@twistedmatrix.com>} | |
| 20 """ | |
| 21 | |
| 22 from __future__ import nested_scopes | |
| 23 | |
| 24 import os | |
| 25 import errno | |
| 26 | |
| 27 from zope.interface import implements | |
| 28 | |
| 29 # Twisted imports | |
| 30 from twisted.python.runtime import platform | |
| 31 from twisted.internet import error, defer, protocol, interfaces | |
| 32 from twisted.python import log, failure | |
| 33 from twisted.names import dns, common | |
| 34 from twisted.names.error import DNSFormatError, DNSServerError, DNSNameError | |
| 35 from twisted.names.error import DNSNotImplementedError, DNSQueryRefusedError | |
| 36 from twisted.names.error import DNSUnknownError | |
| 37 | |
| 38 | |
| 39 class Resolver(common.ResolverBase): | |
| 40 implements(interfaces.IResolver) | |
| 41 | |
| 42 index = 0 | |
| 43 timeout = None | |
| 44 | |
| 45 factory = None | |
| 46 servers = None | |
| 47 dynServers = () | |
| 48 pending = None | |
| 49 protocol = None | |
| 50 connections = None | |
| 51 | |
| 52 resolv = None | |
| 53 _lastResolvTime = None | |
| 54 _resolvReadInterval = 60 | |
| 55 | |
| 56 _errormap = { | |
| 57 dns.EFORMAT: DNSFormatError, | |
| 58 dns.ESERVER: DNSServerError, | |
| 59 dns.ENAME: DNSNameError, | |
| 60 dns.ENOTIMP: DNSNotImplementedError, | |
| 61 dns.EREFUSED: DNSQueryRefusedError} | |
| 62 | |
| 63 def __init__(self, resolv = None, servers = None, timeout = (1, 3, 11, 45)): | |
| 64 """ | |
| 65 Construct a resolver which will query domain name servers listed in | |
| 66 the C{resolv.conf(5)}-format file given by C{resolv} as well as | |
| 67 those in the given C{servers} list. Servers are queried in a | |
| 68 round-robin fashion. If given, C{resolv} is periodically checked | |
| 69 for modification and re-parsed if it is noticed to have changed. | |
| 70 | |
| 71 @type servers: C{list} of C{(str, int)} or C{None} | |
| 72 @param servers: If not C{None}, interpreted as a list of addresses of | |
| 73 domain name servers to attempt to use for this lookup. Addresses | |
| 74 should be in dotted-quad form. If specified, overrides C{resolv}. | |
| 75 | |
| 76 @type resolv: C{str} | |
| 77 @param resolv: Filename to read and parse as a resolver(5) | |
| 78 configuration file. | |
| 79 | |
| 80 @type timeout: Sequence of C{int} | |
| 81 @param timeout: Default number of seconds after which to reissue the que
ry. | |
| 82 When the last timeout expires, the query is considered failed. | |
| 83 | |
| 84 @raise ValueError: Raised if no nameserver addresses can be found. | |
| 85 """ | |
| 86 common.ResolverBase.__init__(self) | |
| 87 | |
| 88 self.timeout = timeout | |
| 89 | |
| 90 if servers is None: | |
| 91 self.servers = [] | |
| 92 else: | |
| 93 self.servers = servers | |
| 94 | |
| 95 self.resolv = resolv | |
| 96 | |
| 97 if not len(self.servers) and not resolv: | |
| 98 raise ValueError, "No nameservers specified" | |
| 99 | |
| 100 self.factory = DNSClientFactory(self, timeout) | |
| 101 self.factory.noisy = 0 # Be quiet by default | |
| 102 | |
| 103 self.protocol = dns.DNSDatagramProtocol(self) | |
| 104 self.protocol.noisy = 0 # You too | |
| 105 | |
| 106 self.connections = [] | |
| 107 self.pending = [] | |
| 108 | |
| 109 self.maybeParseConfig() | |
| 110 | |
| 111 | |
| 112 def __getstate__(self): | |
| 113 d = self.__dict__.copy() | |
| 114 d['connections'] = [] | |
| 115 d['_parseCall'] = None | |
| 116 return d | |
| 117 | |
| 118 | |
| 119 def __setstate__(self, state): | |
| 120 self.__dict__.update(state) | |
| 121 self.maybeParseConfig() | |
| 122 | |
| 123 | |
| 124 def maybeParseConfig(self): | |
| 125 if self.resolv is None: | |
| 126 # Don't try to parse it, don't set up a call loop | |
| 127 return | |
| 128 | |
| 129 try: | |
| 130 resolvConf = file(self.resolv) | |
| 131 except IOError, e: | |
| 132 if e.errno == errno.ENOENT: | |
| 133 # Missing resolv.conf is treated the same as an empty resolv.con
f | |
| 134 self.parseConfig(()) | |
| 135 else: | |
| 136 raise | |
| 137 else: | |
| 138 mtime = os.fstat(resolvConf.fileno()).st_mtime | |
| 139 if mtime != self._lastResolvTime: | |
| 140 log.msg('%s changed, reparsing' % (self.resolv,)) | |
| 141 self._lastResolvTime = mtime | |
| 142 self.parseConfig(resolvConf) | |
| 143 | |
| 144 # Check again in a little while | |
| 145 from twisted.internet import reactor | |
| 146 self._parseCall = reactor.callLater(self._resolvReadInterval, self.maybe
ParseConfig) | |
| 147 | |
| 148 | |
| 149 def parseConfig(self, resolvConf): | |
| 150 servers = [] | |
| 151 for L in resolvConf: | |
| 152 L = L.strip() | |
| 153 if L.startswith('nameserver'): | |
| 154 resolver = (L.split()[1], dns.PORT) | |
| 155 servers.append(resolver) | |
| 156 log.msg("Resolver added %r to server list" % (resolver,)) | |
| 157 elif L.startswith('domain'): | |
| 158 try: | |
| 159 self.domain = L.split()[1] | |
| 160 except IndexError: | |
| 161 self.domain = '' | |
| 162 self.search = None | |
| 163 elif L.startswith('search'): | |
| 164 try: | |
| 165 self.search = L.split()[1:] | |
| 166 except IndexError: | |
| 167 self.search = '' | |
| 168 self.domain = None | |
| 169 if not servers: | |
| 170 servers.append(('127.0.0.1', dns.PORT)) | |
| 171 self.dynServers = servers | |
| 172 | |
| 173 | |
| 174 def pickServer(self): | |
| 175 """ | |
| 176 Return the address of a nameserver. | |
| 177 | |
| 178 TODO: Weight servers for response time so faster ones can be | |
| 179 preferred. | |
| 180 """ | |
| 181 if not self.servers and not self.dynServers: | |
| 182 return None | |
| 183 serverL = len(self.servers) | |
| 184 dynL = len(self.dynServers) | |
| 185 | |
| 186 self.index += 1 | |
| 187 self.index %= (serverL + dynL) | |
| 188 if self.index < serverL: | |
| 189 return self.servers[self.index] | |
| 190 else: | |
| 191 return self.dynServers[self.index - serverL] | |
| 192 | |
| 193 def connectionMade(self, protocol): | |
| 194 self.connections.append(protocol) | |
| 195 for (d, q, t) in self.pending: | |
| 196 self.queryTCP(q, t).chainDeferred(d) | |
| 197 del self.pending[:] | |
| 198 | |
| 199 | |
| 200 def messageReceived(self, message, protocol, address = None): | |
| 201 log.msg("Unexpected message (%d) received from %r" % (message.id, addres
s)) | |
| 202 | |
| 203 | |
| 204 def queryUDP(self, queries, timeout = None): | |
| 205 """ | |
| 206 Make a number of DNS queries via UDP. | |
| 207 | |
| 208 @type queries: A C{list} of C{dns.Query} instances | |
| 209 @param queries: The queries to make. | |
| 210 | |
| 211 @type timeout: Sequence of C{int} | |
| 212 @param timeout: Number of seconds after which to reissue the query. | |
| 213 When the last timeout expires, the query is considered failed. | |
| 214 | |
| 215 @rtype: C{Deferred} | |
| 216 @raise C{twisted.internet.defer.TimeoutError}: When the query times | |
| 217 out. | |
| 218 """ | |
| 219 if timeout is None: | |
| 220 timeout = self.timeout | |
| 221 | |
| 222 addresses = self.servers + list(self.dynServers) | |
| 223 if not addresses: | |
| 224 return defer.fail(IOError("No domain name servers available")) | |
| 225 | |
| 226 # Make sure we go through servers in the list in the order they were | |
| 227 # specified. | |
| 228 addresses.reverse() | |
| 229 | |
| 230 used = addresses.pop() | |
| 231 return self.protocol.query(used, queries, timeout[0] | |
| 232 ).addErrback(self._reissue, addresses, [used], queries, timeout | |
| 233 ) | |
| 234 | |
| 235 | |
| 236 def _reissue(self, reason, addressesLeft, addressesUsed, query, timeout): | |
| 237 reason.trap(dns.DNSQueryTimeoutError) | |
| 238 | |
| 239 # If there are no servers left to be tried, adjust the timeout | |
| 240 # to the next longest timeout period and move all the | |
| 241 # "used" addresses back to the list of addresses to try. | |
| 242 if not addressesLeft: | |
| 243 addressesLeft = addressesUsed | |
| 244 addressesLeft.reverse() | |
| 245 addressesUsed = [] | |
| 246 timeout = timeout[1:] | |
| 247 | |
| 248 # If all timeout values have been used, or the protocol has no | |
| 249 # transport, this query has failed. Tell the protocol we're | |
| 250 # giving up on it and return a terminal timeout failure to our | |
| 251 # caller. | |
| 252 if not timeout or self.protocol.transport is None: | |
| 253 self.protocol.removeResend(reason.value.id) | |
| 254 return failure.Failure(defer.TimeoutError(query)) | |
| 255 | |
| 256 # Get an address to try. Take it out of the list of addresses | |
| 257 # to try and put it ino the list of already tried addresses. | |
| 258 address = addressesLeft.pop() | |
| 259 addressesUsed.append(address) | |
| 260 | |
| 261 # Issue a query to a server. Use the current timeout. Add this | |
| 262 # function as a timeout errback in case another retry is required. | |
| 263 d = self.protocol.query(address, query, timeout[0], reason.value.id) | |
| 264 d.addErrback(self._reissue, addressesLeft, addressesUsed, query, timeout
) | |
| 265 return d | |
| 266 | |
| 267 | |
| 268 def queryTCP(self, queries, timeout = 10): | |
| 269 """ | |
| 270 Make a number of DNS queries via TCP. | |
| 271 | |
| 272 @type queries: Any non-zero number of C{dns.Query} instances | |
| 273 @param queries: The queries to make. | |
| 274 | |
| 275 @type timeout: C{int} | |
| 276 @param timeout: The number of seconds after which to fail. | |
| 277 | |
| 278 @rtype: C{Deferred} | |
| 279 """ | |
| 280 if not len(self.connections): | |
| 281 address = self.pickServer() | |
| 282 if address is None: | |
| 283 return defer.fail(IOError("No domain name servers available")) | |
| 284 host, port = address | |
| 285 from twisted.internet import reactor | |
| 286 reactor.connectTCP(host, port, self.factory) | |
| 287 self.pending.append((defer.Deferred(), queries, timeout)) | |
| 288 return self.pending[-1][0] | |
| 289 else: | |
| 290 return self.connections[0].query(queries, timeout) | |
| 291 | |
| 292 | |
| 293 def filterAnswers(self, message): | |
| 294 """ | |
| 295 Extract results from the given message. | |
| 296 | |
| 297 If the message was truncated, re-attempt the query over TCP and return | |
| 298 a Deferred which will fire with the results of that query. | |
| 299 | |
| 300 If the message's result code is not L{dns.OK}, return a Failure | |
| 301 indicating the type of error which occurred. | |
| 302 | |
| 303 Otherwise, return a three-tuple of lists containing the results from | |
| 304 the answers section, the authority section, and the additional section. | |
| 305 """ | |
| 306 if message.trunc: | |
| 307 return self.queryTCP(message.queries).addCallback(self.filterAnswers
) | |
| 308 if message.rCode != dns.OK: | |
| 309 return failure.Failure(self._errormap.get(message.rCode, DNSUnknownE
rror)(message)) | |
| 310 return (message.answers, message.authority, message.additional) | |
| 311 | |
| 312 | |
| 313 def _lookup(self, name, cls, type, timeout): | |
| 314 return self.queryUDP( | |
| 315 [dns.Query(name, type, cls)], timeout | |
| 316 ).addCallback(self.filterAnswers) | |
| 317 | |
| 318 | |
| 319 # This one doesn't ever belong on UDP | |
| 320 def lookupZone(self, name, timeout = 10): | |
| 321 """ | |
| 322 Perform an AXFR request. This is quite different from usual | |
| 323 DNS requests. See http://cr.yp.to/djbdns/axfr-notes.html for | |
| 324 more information. | |
| 325 """ | |
| 326 address = self.pickServer() | |
| 327 if address is None: | |
| 328 return defer.fail(IOError('No domain name servers available')) | |
| 329 host, port = address | |
| 330 d = defer.Deferred() | |
| 331 controller = AXFRController(name, d) | |
| 332 factory = DNSClientFactory(controller, timeout) | |
| 333 factory.noisy = False #stfu | |
| 334 | |
| 335 from twisted.internet import reactor | |
| 336 connector = reactor.connectTCP(host, port, factory) | |
| 337 controller.timeoutCall = reactor.callLater(timeout or 10, | |
| 338 self._timeoutZone, | |
| 339 d, controller, | |
| 340 connector, | |
| 341 timeout or 10) | |
| 342 return d.addCallback(self._cbLookupZone, connector) | |
| 343 | |
| 344 def _timeoutZone(self, d, controller, connector, seconds): | |
| 345 connector.disconnect() | |
| 346 controller.timeoutCall = None | |
| 347 controller.deferred = None | |
| 348 d.errback(error.TimeoutError("Zone lookup timed out after %d seconds" %
(seconds,))) | |
| 349 | |
| 350 def _cbLookupZone(self, result, connector): | |
| 351 connector.disconnect() | |
| 352 return (result, [], []) | |
| 353 | |
| 354 | |
| 355 class AXFRController: | |
| 356 timeoutCall = None | |
| 357 | |
| 358 def __init__(self, name, deferred): | |
| 359 self.name = name | |
| 360 self.deferred = deferred | |
| 361 self.soa = None | |
| 362 self.records = [] | |
| 363 | |
| 364 def connectionMade(self, protocol): | |
| 365 # dig saids recursion-desired to 0, so I will too | |
| 366 message = dns.Message(protocol.pickID(), recDes=0) | |
| 367 message.queries = [dns.Query(self.name, dns.AXFR, dns.IN)] | |
| 368 protocol.writeMessage(message) | |
| 369 | |
| 370 def messageReceived(self, message, protocol): | |
| 371 # Caveat: We have to handle two cases: All records are in 1 | |
| 372 # message, or all records are in N messages. | |
| 373 | |
| 374 # According to http://cr.yp.to/djbdns/axfr-notes.html, | |
| 375 # 'authority' and 'additional' are always empty, and only | |
| 376 # 'answers' is present. | |
| 377 self.records.extend(message.answers) | |
| 378 if not self.records: | |
| 379 return | |
| 380 if not self.soa: | |
| 381 if self.records[0].type == dns.SOA: | |
| 382 #print "first SOA!" | |
| 383 self.soa = self.records[0] | |
| 384 if len(self.records) > 1 and self.records[-1].type == dns.SOA: | |
| 385 #print "It's the second SOA! We're done." | |
| 386 if self.timeoutCall is not None: | |
| 387 self.timeoutCall.cancel() | |
| 388 self.timeoutCall = None | |
| 389 if self.deferred is not None: | |
| 390 self.deferred.callback(self.records) | |
| 391 self.deferred = None | |
| 392 | |
| 393 | |
| 394 | |
| 395 from twisted.internet.base import ThreadedResolver as _ThreadedResolverImpl | |
| 396 | |
| 397 class ThreadedResolver(_ThreadedResolverImpl): | |
| 398 def __init__(self, reactor=None): | |
| 399 if reactor is None: | |
| 400 from twisted.internet import reactor | |
| 401 _ThreadedResolverImpl.__init__(self, reactor) | |
| 402 # warnings.warn("twisted.names.client.ThreadedResolver is deprecated, us
e XXX instead.") | |
| 403 | |
| 404 class DNSClientFactory(protocol.ClientFactory): | |
| 405 def __init__(self, controller, timeout = 10): | |
| 406 self.controller = controller | |
| 407 self.timeout = timeout | |
| 408 | |
| 409 | |
| 410 def clientConnectionLost(self, connector, reason): | |
| 411 pass | |
| 412 | |
| 413 | |
| 414 def buildProtocol(self, addr): | |
| 415 p = dns.DNSProtocol(self.controller) | |
| 416 p.factory = self | |
| 417 return p | |
| 418 | |
| 419 | |
| 420 | |
| 421 def createResolver(servers=None, resolvconf=None, hosts=None): | |
| 422 """ | |
| 423 Create and return a Resolver. | |
| 424 | |
| 425 @type servers: C{list} of C{(str, int)} or C{None} | |
| 426 @param servers: If not C{None}, interpreted as a list of addresses of | |
| 427 domain name servers to attempt to use. Addresses should be in dotted-quad | |
| 428 form. | |
| 429 | |
| 430 @type resolvconf: C{str} or C{None} | |
| 431 @param resolvconf: If not C{None}, on posix systems will be interpreted as | |
| 432 an alternate resolv.conf to use. Will do nothing on windows systems. If | |
| 433 C{None}, /etc/resolv.conf will be used. | |
| 434 | |
| 435 @type hosts: C{str} or C{None} | |
| 436 @param hosts: If not C{None}, an alternate hosts file to use. If C{None} | |
| 437 on posix systems, /etc/hosts will be used. On windows, C:\windows\hosts | |
| 438 will be used. | |
| 439 | |
| 440 @rtype: C{IResolver} | |
| 441 """ | |
| 442 from twisted.names import resolve, cache, root, hosts as hostsModule | |
| 443 if platform.getType() == 'posix': | |
| 444 if resolvconf is None: | |
| 445 resolvconf = '/etc/resolv.conf' | |
| 446 if hosts is None: | |
| 447 hosts = '/etc/hosts' | |
| 448 theResolver = Resolver(resolvconf, servers) | |
| 449 hostResolver = hostsModule.Resolver(hosts) | |
| 450 else: | |
| 451 if hosts is None: | |
| 452 hosts = r'c:\windows\hosts' | |
| 453 from twisted.internet import reactor | |
| 454 bootstrap = _ThreadedResolverImpl(reactor) | |
| 455 hostResolver = hostsModule.Resolver(hosts) | |
| 456 theResolver = root.bootstrap(bootstrap) | |
| 457 | |
| 458 L = [hostResolver, cache.CacheResolver(), theResolver] | |
| 459 return resolve.ResolverChain(L) | |
| 460 | |
| 461 theResolver = None | |
| 462 def getResolver(): | |
| 463 """ | |
| 464 Get a Resolver instance. | |
| 465 | |
| 466 Create twisted.names.client.theResolver if it is C{None}, and then return | |
| 467 that value. | |
| 468 | |
| 469 @rtype: C{IResolver} | |
| 470 """ | |
| 471 global theResolver | |
| 472 if theResolver is None: | |
| 473 try: | |
| 474 theResolver = createResolver() | |
| 475 except ValueError: | |
| 476 theResolver = createResolver(servers=[('127.0.0.1', 53)]) | |
| 477 return theResolver | |
| 478 | |
| 479 def getHostByName(name, timeout=None, effort=10): | |
| 480 """ | |
| 481 Resolve a name to a valid ipv4 or ipv6 address. | |
| 482 | |
| 483 Will errback with C{DNSQueryTimeoutError} on a timeout, C{DomainError} or | |
| 484 C{AuthoritativeDomainError} (or subclasses) on other errors. | |
| 485 | |
| 486 @type name: C{str} | |
| 487 @param name: DNS name to resolve. | |
| 488 | |
| 489 @type timeout: Sequence of C{int} | |
| 490 @param timeout: Number of seconds after which to reissue the query. | |
| 491 When the last timeout expires, the query is considered failed. | |
| 492 | |
| 493 @type effort: C{int} | |
| 494 @param effort: How many times CNAME and NS records to follow while | |
| 495 resolving this name. | |
| 496 | |
| 497 @rtype: C{Deferred} | |
| 498 """ | |
| 499 return getResolver().getHostByName(name, timeout, effort) | |
| 500 | |
| 501 def lookupAddress(name, timeout=None): | |
| 502 """ | |
| 503 Perform an A record lookup. | |
| 504 | |
| 505 @type name: C{str} | |
| 506 @param name: DNS name to resolve. | |
| 507 | |
| 508 @type timeout: Sequence of C{int} | |
| 509 @param timeout: Number of seconds after which to reissue the query. | |
| 510 When the last timeout expires, the query is considered failed. | |
| 511 | |
| 512 @rtype: C{Deferred} | |
| 513 """ | |
| 514 return getResolver().lookupAddress(name, timeout) | |
| 515 | |
| 516 def lookupIPV6Address(name, timeout=None): | |
| 517 """ | |
| 518 Perform an AAAA record lookup. | |
| 519 | |
| 520 @type name: C{str} | |
| 521 @param name: DNS name to resolve. | |
| 522 | |
| 523 @type timeout: Sequence of C{int} | |
| 524 @param timeout: Number of seconds after which to reissue the query. | |
| 525 When the last timeout expires, the query is considered failed. | |
| 526 | |
| 527 @rtype: C{Deferred} | |
| 528 """ | |
| 529 return getResolver().lookupIPV6Address(name, timeout) | |
| 530 | |
| 531 def lookupAddress6(name, timeout=None): | |
| 532 """ | |
| 533 Perform an A6 record lookup. | |
| 534 | |
| 535 @type name: C{str} | |
| 536 @param name: DNS name to resolve. | |
| 537 | |
| 538 @type timeout: Sequence of C{int} | |
| 539 @param timeout: Number of seconds after which to reissue the query. | |
| 540 When the last timeout expires, the query is considered failed. | |
| 541 | |
| 542 @rtype: C{Deferred} | |
| 543 """ | |
| 544 return getResolver().lookupAddress6(name, timeout) | |
| 545 | |
| 546 def lookupMailExchange(name, timeout=None): | |
| 547 """ | |
| 548 Perform an MX record lookup. | |
| 549 | |
| 550 @type name: C{str} | |
| 551 @param name: DNS name to resolve. | |
| 552 | |
| 553 @type timeout: Sequence of C{int} | |
| 554 @param timeout: Number of seconds after which to reissue the query. | |
| 555 When the last timeout expires, the query is considered failed. | |
| 556 | |
| 557 @rtype: C{Deferred} | |
| 558 """ | |
| 559 return getResolver().lookupMailExchange(name, timeout) | |
| 560 | |
| 561 def lookupNameservers(name, timeout=None): | |
| 562 """ | |
| 563 Perform an NS record lookup. | |
| 564 | |
| 565 @type name: C{str} | |
| 566 @param name: DNS name to resolve. | |
| 567 | |
| 568 @type timeout: Sequence of C{int} | |
| 569 @param timeout: Number of seconds after which to reissue the query. | |
| 570 When the last timeout expires, the query is considered failed. | |
| 571 | |
| 572 @rtype: C{Deferred} | |
| 573 """ | |
| 574 return getResolver().lookupNameservers(name, timeout) | |
| 575 | |
| 576 def lookupCanonicalName(name, timeout=None): | |
| 577 """ | |
| 578 Perform a CNAME record lookup. | |
| 579 | |
| 580 @type name: C{str} | |
| 581 @param name: DNS name to resolve. | |
| 582 | |
| 583 @type timeout: Sequence of C{int} | |
| 584 @param timeout: Number of seconds after which to reissue the query. | |
| 585 When the last timeout expires, the query is considered failed. | |
| 586 | |
| 587 @rtype: C{Deferred} | |
| 588 """ | |
| 589 return getResolver().lookupCanonicalName(name, timeout) | |
| 590 | |
| 591 def lookupMailBox(name, timeout=None): | |
| 592 """ | |
| 593 Perform an MB record lookup. | |
| 594 | |
| 595 @type name: C{str} | |
| 596 @param name: DNS name to resolve. | |
| 597 | |
| 598 @type timeout: Sequence of C{int} | |
| 599 @param timeout: Number of seconds after which to reissue the query. | |
| 600 When the last timeout expires, the query is considered failed. | |
| 601 | |
| 602 @rtype: C{Deferred} | |
| 603 """ | |
| 604 return getResolver().lookupMailBox(name, timeout) | |
| 605 | |
| 606 def lookupMailGroup(name, timeout=None): | |
| 607 """ | |
| 608 Perform an MG record lookup. | |
| 609 | |
| 610 @type name: C{str} | |
| 611 @param name: DNS name to resolve. | |
| 612 | |
| 613 @type timeout: Sequence of C{int} | |
| 614 @param timeout: Number of seconds after which to reissue the query. | |
| 615 When the last timeout expires, the query is considered failed. | |
| 616 | |
| 617 @rtype: C{Deferred} | |
| 618 """ | |
| 619 return getResolver().lookupMailGroup(name, timeout) | |
| 620 | |
| 621 def lookupMailRename(name, timeout=None): | |
| 622 """ | |
| 623 Perform an MR record lookup. | |
| 624 | |
| 625 @type name: C{str} | |
| 626 @param name: DNS name to resolve. | |
| 627 | |
| 628 @type timeout: Sequence of C{int} | |
| 629 @param timeout: Number of seconds after which to reissue the query. | |
| 630 When the last timeout expires, the query is considered failed. | |
| 631 | |
| 632 @rtype: C{Deferred} | |
| 633 """ | |
| 634 return getResolver().lookupMailRename(name, timeout) | |
| 635 | |
| 636 def lookupPointer(name, timeout=None): | |
| 637 """ | |
| 638 Perform a PTR record lookup. | |
| 639 | |
| 640 @type name: C{str} | |
| 641 @param name: DNS name to resolve. | |
| 642 | |
| 643 @type timeout: Sequence of C{int} | |
| 644 @param timeout: Number of seconds after which to reissue the query. | |
| 645 When the last timeout expires, the query is considered failed. | |
| 646 | |
| 647 @rtype: C{Deferred} | |
| 648 """ | |
| 649 return getResolver().lookupPointer(name, timeout) | |
| 650 | |
| 651 def lookupAuthority(name, timeout=None): | |
| 652 """ | |
| 653 Perform an SOA record lookup. | |
| 654 | |
| 655 @type name: C{str} | |
| 656 @param name: DNS name to resolve. | |
| 657 | |
| 658 @type timeout: Sequence of C{int} | |
| 659 @param timeout: Number of seconds after which to reissue the query. | |
| 660 When the last timeout expires, the query is considered failed. | |
| 661 | |
| 662 @rtype: C{Deferred} | |
| 663 """ | |
| 664 return getResolver().lookupAuthority(name, timeout) | |
| 665 | |
| 666 def lookupNull(name, timeout=None): | |
| 667 """ | |
| 668 Perform a NULL record lookup. | |
| 669 | |
| 670 @type name: C{str} | |
| 671 @param name: DNS name to resolve. | |
| 672 | |
| 673 @type timeout: Sequence of C{int} | |
| 674 @param timeout: Number of seconds after which to reissue the query. | |
| 675 When the last timeout expires, the query is considered failed. | |
| 676 | |
| 677 @rtype: C{Deferred} | |
| 678 """ | |
| 679 return getResolver().lookupNull(name, timeout) | |
| 680 | |
| 681 def lookupWellKnownServices(name, timeout=None): | |
| 682 """ | |
| 683 Perform a WKS record lookup. | |
| 684 | |
| 685 @type name: C{str} | |
| 686 @param name: DNS name to resolve. | |
| 687 | |
| 688 @type timeout: Sequence of C{int} | |
| 689 @param timeout: Number of seconds after which to reissue the query. | |
| 690 When the last timeout expires, the query is considered failed. | |
| 691 | |
| 692 @rtype: C{Deferred} | |
| 693 """ | |
| 694 return getResolver().lookupWellKnownServices(name, timeout) | |
| 695 | |
| 696 def lookupService(name, timeout=None): | |
| 697 """ | |
| 698 Perform an SRV record lookup. | |
| 699 | |
| 700 @type name: C{str} | |
| 701 @param name: DNS name to resolve. | |
| 702 | |
| 703 @type timeout: Sequence of C{int} | |
| 704 @param timeout: Number of seconds after which to reissue the query. | |
| 705 When the last timeout expires, the query is considered failed. | |
| 706 | |
| 707 @rtype: C{Deferred} | |
| 708 """ | |
| 709 return getResolver().lookupService(name, timeout) | |
| 710 | |
| 711 def lookupHostInfo(name, timeout=None): | |
| 712 """ | |
| 713 Perform a HINFO record lookup. | |
| 714 | |
| 715 @type name: C{str} | |
| 716 @param name: DNS name to resolve. | |
| 717 | |
| 718 @type timeout: Sequence of C{int} | |
| 719 @param timeout: Number of seconds after which to reissue the query. | |
| 720 When the last timeout expires, the query is considered failed. | |
| 721 | |
| 722 @rtype: C{Deferred} | |
| 723 """ | |
| 724 return getResolver().lookupHostInfo(name, timeout) | |
| 725 | |
| 726 def lookupMailboxInfo(name, timeout=None): | |
| 727 """ | |
| 728 Perform an MINFO record lookup. | |
| 729 | |
| 730 @type name: C{str} | |
| 731 @param name: DNS name to resolve. | |
| 732 | |
| 733 @type timeout: Sequence of C{int} | |
| 734 @param timeout: Number of seconds after which to reissue the query. | |
| 735 When the last timeout expires, the query is considered failed. | |
| 736 | |
| 737 @rtype: C{Deferred} | |
| 738 """ | |
| 739 return getResolver().lookupMailboxInfo(name, timeout) | |
| 740 | |
| 741 def lookupText(name, timeout=None): | |
| 742 """ | |
| 743 Perform a TXT record lookup. | |
| 744 | |
| 745 @type name: C{str} | |
| 746 @param name: DNS name to resolve. | |
| 747 | |
| 748 @type timeout: Sequence of C{int} | |
| 749 @param timeout: Number of seconds after which to reissue the query. | |
| 750 When the last timeout expires, the query is considered failed. | |
| 751 | |
| 752 @rtype: C{Deferred} | |
| 753 """ | |
| 754 return getResolver().lookupText(name, timeout) | |
| 755 | |
| 756 def lookupResponsibility(name, timeout=None): | |
| 757 """ | |
| 758 Perform an RP record lookup. | |
| 759 | |
| 760 @type name: C{str} | |
| 761 @param name: DNS name to resolve. | |
| 762 | |
| 763 @type timeout: Sequence of C{int} | |
| 764 @param timeout: Number of seconds after which to reissue the query. | |
| 765 When the last timeout expires, the query is considered failed. | |
| 766 | |
| 767 @rtype: C{Deferred} | |
| 768 """ | |
| 769 return getResolver().lookupResponsibility(name, timeout) | |
| 770 | |
| 771 def lookupAFSDatabase(name, timeout=None): | |
| 772 """ | |
| 773 Perform an AFSDB record lookup. | |
| 774 | |
| 775 @type name: C{str} | |
| 776 @param name: DNS name to resolve. | |
| 777 | |
| 778 @type timeout: Sequence of C{int} | |
| 779 @param timeout: Number of seconds after which to reissue the query. | |
| 780 When the last timeout expires, the query is considered failed. | |
| 781 | |
| 782 @rtype: C{Deferred} | |
| 783 """ | |
| 784 return getResolver().lookupAFSDatabase(name, timeout) | |
| 785 | |
| 786 def lookupZone(name, timeout=None): | |
| 787 """ | |
| 788 Perform an AXFR record lookup. | |
| 789 | |
| 790 @type name: C{str} | |
| 791 @param name: DNS name to resolve. | |
| 792 | |
| 793 @type timeout: C{int} | |
| 794 @param timeout: When this timeout expires, the query is considered failed. | |
| 795 | |
| 796 @rtype: C{Deferred} | |
| 797 """ | |
| 798 # XXX: timeout here is not a list of ints, it is a single int. | |
| 799 return getResolver().lookupZone(name, timeout) | |
| 800 | |
| 801 def lookupAllRecords(name, timeout=None): | |
| 802 """ | |
| 803 ALL_RECORD lookup. | |
| 804 | |
| 805 @type name: C{str} | |
| 806 @param name: DNS name to resolve. | |
| 807 | |
| 808 @type timeout: Sequence of C{int} | |
| 809 @param timeout: Number of seconds after which to reissue the query. | |
| 810 When the last timeout expires, the query is considered failed. | |
| 811 | |
| 812 @rtype: C{Deferred} | |
| 813 """ | |
| 814 return getResolver().lookupAllRecords(name, timeout) | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 12261012:
Remove third_party/twisted_8_1 (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/tools/build