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""" IPv6-aware hostname resolution. @see: L{IHostnameResolver} """ from __future__ import division, absolute_import __metaclass__ = type from socket import (getaddrinfo, AF_INET, AF_INET6, AF_UNSPEC, SOCK_STREAM, SOCK_DGRAM, gaierror) from zope.interface import implementer from twisted.internet.interfaces import (IHostnameResolver, IHostResolution, IResolverSimple, IResolutionReceiver) from twisted.internet.error import DNSLookupError from twisted.internet.defer import Deferred from twisted.internet.threads import deferToThreadPool from twisted.internet.address import IPv4Address, IPv6Address from twisted.python.compat import nativeString from twisted.internet._idna import _idnaBytes from twisted.logger import Logger @implementer(IHostResolution) class HostResolution(object): """ The in-progress resolution of a given hostname. """ def __init__(self, name): """ Create a L{HostResolution} with the given name. """ self.name = name _any = frozenset([IPv4Address, IPv6Address]) _typesToAF = { frozenset([IPv4Address]): AF_INET, frozenset([IPv6Address]): AF_INET6, _any: AF_UNSPEC, } _afToType = { AF_INET: IPv4Address, AF_INET6: IPv6Address, } _transportToSocket = { 'TCP': SOCK_STREAM, 'UDP': SOCK_DGRAM, } _socktypeToType = { SOCK_STREAM: 'TCP', SOCK_DGRAM: 'UDP', } @implementer(IHostnameResolver) class GAIResolver(object): """ L{IHostnameResolver} implementation that resolves hostnames by calling L{getaddrinfo} in a thread. """ def __init__(self, reactor, getThreadPool=None, getaddrinfo=getaddrinfo): """ Create a L{GAIResolver}. @param reactor: the reactor to schedule result-delivery on @type reactor: L{IReactorThreads} @param getThreadPool: a function to retrieve the thread pool to use for scheduling name resolutions. If not supplied, the use the given C{reactor}'s thread pool. @type getThreadPool: 0-argument callable returning a L{twisted.python.threadpool.ThreadPool} @param getaddrinfo: a reference to the L{getaddrinfo} to use - mainly parameterized for testing. @type getaddrinfo: callable with the same signature as L{getaddrinfo} """ self._reactor = reactor self._getThreadPool = (reactor.getThreadPool if getThreadPool is None else getThreadPool) self._getaddrinfo = getaddrinfo def resolveHostName(self, resolutionReceiver, hostName, portNumber=0, addressTypes=None, transportSemantics='TCP'): """ See L{IHostnameResolver.resolveHostName} @param resolutionReceiver: see interface @param hostName: see interface @param portNumber: see interface @param addressTypes: see interface @param transportSemantics: see interface @return: see interface """ pool = self._getThreadPool() addressFamily = _typesToAF[_any if addressTypes is None else frozenset(addressTypes)] socketType = _transportToSocket[transportSemantics] def get(): try: return self._getaddrinfo(hostName, portNumber, addressFamily, socketType) except gaierror: return [] d = deferToThreadPool(self._reactor, pool, get) resolution = HostResolution(hostName) resolutionReceiver.resolutionBegan(resolution) @d.addCallback def deliverResults(result): for family, socktype, proto, cannoname, sockaddr in result: addrType = _afToType[family] resolutionReceiver.addressResolved( addrType(_socktypeToType.get(socktype, 'TCP'), *sockaddr) ) resolutionReceiver.resolutionComplete() return resolution @implementer(IHostnameResolver) class SimpleResolverComplexifier(object): """ A converter from L{IResolverSimple} to L{IHostnameResolver}. """ _log = Logger() def __init__(self, simpleResolver): """ Construct a L{SimpleResolverComplexifier} with an L{IResolverSimple}. """ self._simpleResolver = simpleResolver def resolveHostName(self, resolutionReceiver, hostName, portNumber=0, addressTypes=None, transportSemantics='TCP'): """ See L{IHostnameResolver.resolveHostName} @param resolutionReceiver: see interface @param hostName: see interface @param portNumber: see interface @param addressTypes: see interface @param transportSemantics: see interface @return: see interface """ # If it's str, we need to make sure that it's just ASCII. try: hostName = hostName.encode('ascii') except UnicodeEncodeError: # If it's not just ASCII, IDNA it. We don't want to give a Unicode # string with non-ASCII in it to Python 3, as if anyone passes that # to a Python 3 stdlib function, it will probably use the wrong # IDNA version and break absolutely everything hostName = _idnaBytes(hostName) # Make sure it's passed down as a native str, to maintain the interface hostName = nativeString(hostName) resolution = HostResolution(hostName) resolutionReceiver.resolutionBegan(resolution) onAddress = self._simpleResolver.getHostByName(hostName) def addressReceived(address): resolutionReceiver.addressResolved(IPv4Address('TCP', address, portNumber)) def errorReceived(error): if not error.check(DNSLookupError): self._log.failure("while looking up {name} with {resolver}", error, name=hostName, resolver=self._simpleResolver) onAddress.addCallbacks(addressReceived, errorReceived) def finish(result): resolutionReceiver.resolutionComplete() onAddress.addCallback(finish) return resolution @implementer(IResolutionReceiver) class FirstOneWins(object): """ An L{IResolutionReceiver} which fires a L{Deferred} with its first result. """ def __init__(self, deferred): """ @param deferred: The L{Deferred} to fire when the first resolution result arrives. """ self._deferred = deferred self._resolved = False def resolutionBegan(self, resolution): """ See L{IResolutionReceiver.resolutionBegan} @param resolution: See L{IResolutionReceiver.resolutionBegan} """ self._resolution = resolution def addressResolved(self, address): """ See L{IResolutionReceiver.addressResolved} @param address: See L{IResolutionReceiver.addressResolved} """ if self._resolved: return self._resolved = True self._deferred.callback(address.host) def resolutionComplete(self): """ See L{IResolutionReceiver.resolutionComplete} """ if self._resolved: return self._deferred.errback(DNSLookupError(self._resolution.name)) @implementer(IResolverSimple) class ComplexResolverSimplifier(object): """ A converter from L{IHostnameResolver} to L{IResolverSimple} """ def __init__(self, nameResolver): """ Create a L{ComplexResolverSimplifier} with an L{IHostnameResolver}. @param nameResolver: The L{IHostnameResolver} to use. """ self._nameResolver = nameResolver def getHostByName(self, name, timeouts=()): """ See L{IResolverSimple.getHostByName} @param name: see L{IResolverSimple.getHostByName} @param timeouts: see L{IResolverSimple.getHostByName} @return: see L{IResolverSimple.getHostByName} """ result = Deferred() self._nameResolver.resolveHostName(FirstOneWins(result), name, 0, [IPv4Address]) return result