hVbSrSSKrSSKJr SSKJrJr SSKJr "SS\R5r g)a` Async DNS server Future plans: - Better config file format maybe - Make sure to differentiate between different classes - notice truncation bit Important: No additional processing is done on some of the record types. This violates the most basic RFC and is just plain annoying for resolvers to deal with. Fix it. @author: Jp Calderone N)protocol)dnsresolve)logc\rSrSrSr\R rSr\Rr SSjr Sr Sr SrSrS r\R"SSS4S jrS rS rS rSrSrSrSrSSjrSrSrg)DNSServerFactorya Server factory and tracker for L{DNSProtocol} connections. This class also provides records for responses to DNS queries. @ivar cache: A L{Cache} instance whose C{cacheResult} method is called when a response is received from one of C{clients}. Defaults to L{None} if no caches are specified. See C{caches} of L{__init__} for more details. @type cache: L{Cache} or L{None} @ivar canRecurse: A flag indicating whether this server is capable of performing recursive DNS resolution. @type canRecurse: L{bool} @ivar resolver: A L{resolve.ResolverChain} containing an ordered list of C{authorities}, C{caches} and C{clients} to which queries will be dispatched. @type resolver: L{resolve.ResolverChain} @ivar verbose: See L{__init__} @ivar connections: A list of all the connected L{DNSProtocol} instances using this object as their controller. @type connections: C{list} of L{DNSProtocol} instances @ivar protocol: A callable used for building a DNS stream protocol. Called by L{DNSServerFactory.buildProtocol} and passed the L{DNSServerFactory} instance as the one and only positional argument. Defaults to L{dns.DNSProtocol}. @type protocol: L{IProtocolFactory} constructor @ivar _messageFactory: A response message constructor with an initializer signature matching L{dns.Message.__init__}. @type _messageFactory: C{callable} Nc/nUbURU5 UbURU5 UbURU5 U(Ul[R"U5UlX@lU(a USUl/Ulg)a, @param authorities: Resolvers which provide authoritative answers. @type authorities: L{list} of L{IResolver} providers @param caches: Resolvers which provide cached non-authoritative answers. The first cache instance is assigned to C{DNSServerFactory.cache} and its C{cacheResult} method will be called when a response is received from one of C{clients}. @type caches: L{list} of L{Cache} instances @param clients: Resolvers which are capable of performing recursive DNS lookups. @type clients: L{list} of L{IResolver} providers @param verbose: An integer controlling the verbosity of logging of queries and responses. Default is C{0} which means no logging. Set to C{2} to enable logging of full query and response messages. @type verbose: L{int} N)extend canRecurser ResolverChainresolververbosecache connections)self authoritiescachesclientsr resolverss [/root/1688_scrapy/alibaba-scraper/venv/lib/python3.13/site-packages/twisted/names/server.py__init__DNSServerFactory.__init__Es{(  "   [ )     V $     W %")k--i8  DJcRURS:a[R"U0UD6 gg)z Log a message only if verbose logging is enabled. @param args: Positional arguments which will be passed to C{log.msg} @param kwargs: Keyword arguments which will be passed to C{log.msg} rN)rrmsg)rargskwargss r _verboseLogDNSServerFactory._verboseLoghs& <1}. @param protocol: The DNS protocol instance to which to send the message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The DNS message to be sent. @type message: L{dns.Message} @param address: The address to which the message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None}  zReplying with no answersz Answers are z Authority is zAdditional is Nz Processed query in %0.3f seconds) rjoinanswersstrpayload authority additionalrr writeMessager time timeReceived)rrmessageaddressasauthadds r sendReplyDNSServerFactory.sendReplys+" <recAvrCoderBr=) isAuthoritativer_responseFromMessage_messageFactoryr getattrr=maxSizer6r9r:) rr>rIr6r9r:authoritativeAnswerxresponses rrK%DNSServerFactory._responseFromMessages\ ?G  I  J#A  ""&*# ++ $ 4 4//$  !( F #??"&(rcUupVnURU[RXVUS9nURX!U5 [ U5[ U5-[ U5-nUR SXS:g=(a S=(d S4-5 UR (a4U(a,UR RURSXVU45 ggg)a A callback used by L{DNSServerFactory.handleQuery} for handling the deferred response from C{self.resolver.query}. Constructs a response message by combining the original query message with the resolved answer, authority and additional records. Marks the response message as authoritative if any of the resolved answers are found to be authoritative. The resolved answers count will be logged if C{DNSServerFactory.verbose} is C{>1}. @param response: Answer records, authority records and additional records @type response: L{tuple} of L{list} of L{dns.RRHeader} instances @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} )r>rIr6r9r:zLookup found %d record%sr3rArN) rKrOKrDlenr r cacheResultqueries) rrQrr>r?ansrBrCls rgotResolverResponse$DNSServerFactory.gotResolverResponses:"3,,3663SV-  x73 Hs4y 3s8 + 3qq&.S:NB6OOP ::! JJ " "7??1#537G H:rc<UR[R[R5(a[RnO&[R n[ R"U5 URX5S9nURX&U5 URS5 g)a} A callback used by L{DNSServerFactory.handleQuery} for handling deferred errors from C{self.resolver.query}. Constructs a response message from the original query message by assigning a suitable error code to C{rCode}. An error message will be logged if C{DNSServerFactory.verbose} is C{>1}. @param failure: The reason for the failed resolution (as reported by C{self.resolver.query}). @type failure: L{Failure} @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} )r>rIz Lookup failedN) checkr DomainErrorAuthoritativeDomainErrorENAMEESERVERrerrrKrDr )rfailurerr>r?rIrQs rgotResolverError!DNSServerFactory.gotResolverError*sl4 ==#*F*F G GIIEKKE GGG ,,W,J x73 )rcURSnURRU5RURX!U5R UR X!U5$)a Called by L{DNSServerFactory.messageReceived} when a query message is received. Takes the first query from the received message and dispatches it to C{self.resolver.query}. Adds callbacks L{DNSServerFactory.gotResolverResponse} and L{DNSServerFactory.gotResolverError} to the resulting deferred. Note: Multiple queries in a single message are not supported because there is no standard way to respond with multiple rCodes, auth, etc. This is consistent with other DNS server implementations. See U{http://tools.ietf.org/html/draft-ietf-dnsext-edns1-03} for a proposed solution. @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} @return: A C{deferred} which fires with the resolved result or error of the first query in C{message}. @rtype: L{Deferred} r)rXrquery addCallbackr[ addErrbackre)rr>rr?rhs r handleQueryDNSServerFactory.handleQueryOsTB" MM   & [118g N Z--x' J rc|[RUlURX!U5 UR SU<35 g)a Called by L{DNSServerFactory.messageReceived} when an inverse query message is received. Replies with a I{Not Implemented} error by default. An error message will be logged if C{DNSServerFactory.verbose} is C{>1}. Override in a subclass. @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} zInverse query from NrENOTIMPrIrDr rr>rr?s rhandleInverseQuery#DNSServerFactory.handleInverseQueryxs3.   x'2 .wk:;rc|[RUlURX!U5 UR SU<35 g)a Called by L{DNSServerFactory.messageReceived} when a status message is received. Replies with a I{Not Implemented} error by default. An error message will be logged if C{DNSServerFactory.verbose} is C{>1}. Override in a subclass. @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} zStatus request from Nrnrps r handleStatusDNSServerFactory.handleStatus3.   x'2 /{;1}. Override in a subclass. @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} zNotify message from Nrnrps r handleNotifyDNSServerFactory.handleNotifyrvrc[RUlURX!U5 UR SUR U4-5 g)a Called by L{DNSServerFactory.messageReceived} when a message with unrecognised I{OPCODE} is received. Replies with a I{Not Implemented} error by default. An error message will be logged if C{DNSServerFactory.verbose} is C{>1}. Override in a subclass. @param protocol: The DNS protocol instance to which to send a response message. @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param message: The original DNS query message for which a response message will be constructed. @type message: L{dns.Message} @param address: The address to which the response message will be sent or L{None} if C{protocol} is a stream protocol. @type address: L{tuple} or L{None} zUnknown op code (%d) from %rN)rrorIrDr opCoderps r handleOtherDNSServerFactory.handleOthers:.   x'2 77>>7:SSTrc [R"5UlUR(Ga#URS:a6SRURVs/sHn[ U5PM sn5nOTSRURVs/sH-n[ RRURS5PM/ sn5n[U5(d<[R"SU=(d URR5<35 O=[R"USU=(d URR5<35 URXU5(d([ R UlUR%X!U5 gUR&[ R(:XaUR+XU5 gUR&[ R,:XaUR/XU5 gUR&[ R0:XaUR3XU5 gUR&[ R4:XaUR7XU5 gUR9XU5 gs snfs snf)a L{DNSServerFactory.messageReceived} is called by protocols which are under the control of this L{DNSServerFactory} whenever they receive a DNS query message or an unexpected / duplicate / late DNS response message. L{DNSServerFactory.allowQuery} is called with the received message, protocol and origin address. If it returns L{False}, a C{dns.EREFUSED} response is sent back to the client. Otherwise the received message is dispatched to one of L{DNSServerFactory.handleQuery}, L{DNSServerFactory.handleInverseQuery}, L{DNSServerFactory.handleStatus}, L{DNSServerFactory.handleNotify}, or L{DNSServerFactory.handleOther} depending on the I{OPCODE} of the received message. If C{DNSServerFactory.verbose} is C{>0} all received messages will be logged in more or less detail depending on the value of C{verbose}. @param message: The DNS message that was received. @type message: L{dns.Message} @param proto: The DNS protocol instance which received the message @type proto: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param address: The address from which the message was received. Only provided for messages received by datagram protocols. The origin of Messages received from stream protocols can be gleaned from the protocol C{transport} attribute. @type address: L{tuple} or L{None} r3r4UNKNOWNzEmpty query from z query from N)r<r=rr5rXr7r QUERY_TYPESgettyperVrr transportgetPeer allowQueryEREFUSEDrIrDr{OP_QUERYrk OP_INVERSErq OP_STATUSrt OP_NOTIFYrxr|)rr>protor?qrAs rmessageReceived DNSServerFactory.messageReceiveds@ $yy{ <<<||aHHgoo>oc!fo>?HHEL__U_S__((;_Uq66+G,Pu7N7N7P+STU1#\'*NU__5L5L5N)QRSww77LLGM NN57 3 ^^s|| +   WW 5 ^^s~~ -  # #GG < ^^s}} ,   gg 6 ^^s}} ,   gg 6   WW 5-?Vs I& 4I+c,[UR5$)a^ Called by L{DNSServerFactory.messageReceived} to decide whether to process a received message or to reply with C{dns.EREFUSED}. This default implementation permits anything but empty queries. Override in a subclass to implement alternative policies. @param message: The DNS message that was received. @type message: L{dns.Message} @param protocol: The DNS protocol instance which received the message @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol} @param address: The address from which the message was received. Only provided for messages received by datagram protocols. The origin of Messages received from stream protocols can be gleaned from the protocol C{transport} attribute. @type address: L{tuple} or L{None} @return: L{True} if the received message contained one or more queries, else L{False}. @rtype: L{bool} )rVrXrps rrDNSServerFactory.allowQuery s27??##r)rr rrr)NNNrr#)__name__ __module__ __qualname____firstlineno____doc__r DNSProtocolrrMessagerLrr r'r,r0rDrUrKr[rerkrqrtrxr|rr__static_attributes__rrrrs"JH EkkO!F% **# L!VVTTdPd'IR#*J' R<6=6=6U6:6x$rr) rr<twisted.internetr twisted.namesrrtwisted.pythonr ServerFactoryrrrrrs,  %&^$x--^$r