Sc@s`dZddlZddlZddlZddlZyddlZWnek reddlZnXddl Z ddl Z ddl Z ddl Z ddlZ ddlZ ddlZ ddlZ ddlZ ddlZ ddlZ ejdkrddlZnde jjfdYZde jjfdYZe jjZde jjfd YZd e jjfd YZd e jjfd YZde jjfdYZde jjfdYZ de!fdYZ"de!fdYZ#de!fdYZ$de!fdYZ%de!fdYZ&e'a(dZ)e j*j+e j,j-e.e'e/ddZ0e j,j-e.e'dZ1iej2gej36ej4gej56Z6e'a7ej8Z9ej:Z;ej<Z=ej>Z?ej@ZAejBZCe'e'ejDdddd ZEdd!ZFe'd"ZGd#ZHd$ZId%ZJe'd&ZKd'ZLdS((s{DNS stub resolver. @var default_resolver: The default resolver object @type default_resolver: dns.resolver.Resolver objectiNtwin32tNXDOMAINcBseZdZRS(sThe query name does not exist.(t__name__t __module__t__doc__(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR.stYXDOMAINcBseZdZRS(s4The query name is too long after DNAME substitution.(RRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR2stNoAnswercBseZdZRS(s7The response did not contain an answer to the question.(RRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR<st NoNameserverscBseZdZRS(s<No non-broken nameservers are available to answer the query.(RRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR@st NotAbsolutecBseZdZRS(sSRaised if an absolute domain name is required but a relative name was provided.(RRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRDst NoRootSOAcBseZdZRS(sYRaised if for some reason there is no SOA at the root name. This should never happen!(RRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR Ist NoMetaqueriescBseZdZRS(sMetaqueries are not allowed.(RRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR NstAnswercBsYeZdZedZdZdZdZdZdZ dZ dZ RS( s9DNS 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 c Cs^||_||_||_||_d}d}x#tddD]}yG|j|j|||}|dks|j|kr|j}nPWq@t k rQ|t j j kr?yj|j|j||t j j } |dks| j|kr| j}nx| D]} | j }PqWw@Wq?t k r;|r<tq<q?Xn|rRtqRq@Xq@W|dkrq|rqtn||_||_|dkrGxyp|j|j||t j j} |dks| j|kr| j}n| dj|kr| dj}nPWqt k r@y|j}WqAt jjk r<PqAXqXqntj||_dS(Niii(tqnametrdtypetrdclasstresponsetNonetxranget find_rrsettanswertttltKeyErrortdnst rdatatypetCNAMEttargetRtcanonical_nametrrsett authoritytSOAtminimumtparenttnametNoParentttimet expiration( tselfR R RRtraise_on_no_answertmin_ttlRtcounttcrrsettrdtsrrset((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt__init__qsf                  cCs~|dkr|jjS|dkr,|jjS|dkrB|jjS|dkrX|jjS|dkrn|jjSt|dS(NR RtcoversRR (RR RR,RR tAttributeError(R$tattr((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt __getattr__s          cCs t|jS(N(tlenR(R$((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt__len__scCs t|jS(N(titerR(R$((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt__iter__scCs |j|S(N(R(R$ti((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt __getitem__scCs|j|=dS(N(R(R$R4((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt __delitem__scCs|j||!S(N(R(R$R4tj((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt __getslice__scCs|j||5dS(N(R(R$R4R7((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt __delslice__s( RRRtTrueR+R/R1R3R5R6R8R9(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR Ss 7      tCachecBsAeZdZddZdZdZdZddZRS(sqSimple DNS answer cache. @ivar data: A dictionary of cached data @type data: dict @ivar cleaning_interval: The number of seconds between cleanings. The default is 300 (5 minutes). @type cleaning_interval: float @ivar next_cleaning: The time the cache should next be cleaned (in seconds since the epoch.) @type next_cleaning: float gr@cCs;i|_||_tj|j|_tj|_dS(sInitialize a DNS cache. @param cleaning_interval: the number of seconds between periodic cleanings. The default is 300.0 @type cleaning_interval: float. N(tdatatcleaning_intervalR"t next_cleaningt _threadingtLocktlock(R$R=((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR+s  cCstj}|j|krg}x<|jjD]+\}}|j|kr1|j|q1q1Wx|D]}|j|=qgWtj}||j|_ndS(s&Clean the cache if it's time to do so.N(R"R>R<t iteritemsR#tappendR=(R$tnowtkeys_to_deletetktv((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt _maybe_cleans   cCskzV|jj|j|jj|}|dksM|jtjkrQdS|SWd|jjXdS(s)Get the answer associated with I{key}. Returns None if no answer is cached for the key. @param key: the key @type key: (dns.name.Name, int, int) tuple whose values are the query name, rdtype, and rdclass. @rtype: dns.resolver.Answer object or None N( RAtacquireRHR<tgetRR#R"trelease(R$tkeyRG((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRJs   !cCs=z(|jj|j||j||jj|r]|j|=q]ni|_tj|j|_Wd|jjXdS(sFlush 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 N( RARIRR<thas_keyR"R=R>RK(R$RL((s2/usr/lib64/python2.7/site-packages/dns/resolver.pytflushs    N( RRRR+RHRJRNRRP(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR;s     t LRUCacheNodecBs2eZdZdZdZdZdZRS(sLRUCache node. cCs(||_||_||_||_dS(N(RLRMtprevtnext(R$RLRM((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR+,s   cCs.|j|_||_||j_||_dS(N(RRRS(R$tnode((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt link_before2s   cCs.||_|j|_||j_||_dS(N(RRRS(R$RT((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt link_after8s   cCs"|j|j_|j|j_dS(N(RRRS(R$((s2/usr/lib64/python2.7/site-packages/dns/resolver.pytunlink>s(RRRR+RURVRW(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRQ)s    tLRUCachecBsAeZdZddZdZdZdZddZRS(sOBounded least-recently-used DNS answer cache. This cache is better than the simple cache (above) if you're running a web crawler or other process that does a lot of resolutions. The LRUCache has a maximum number of nodes, and when it is full, the least-recently used node is removed to make space for a new one. @ivar data: A dictionary of cached data @type data: dict @ivar sentinel: sentinel node for circular doubly linked list of nodes @type sentinel: LRUCacheNode object @ivar max_size: The maximum number of nodes @type max_size: int icCs;i|_|j|tdd|_tj|_dS(sInitialize a DNS cache. @param max_size: The maximum number of nodes to cache; the default is 100000. Must be > 1. @type max_size: int N(R<t set_max_sizeRQRtsentinelR?R@RA(R$tmax_size((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR+Ss  cCs"|dkrd}n||_dS(Ni(R[(R$R[((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRY^s  cCsz}|jj|jj|}|dkr2dS|j|jjtjkre|j|j =dS|j |j |jSWd|jj XdS(s)Get the answer associated with I{key}. Returns None if no answer is cached for the key. @param key: the key @type key: (dns.name.Name, int, int) tuple whose values are the query name, rdtype, and rdclass. @rtype: dns.resolver.Answer object or None N( RARIR<RJRRWRMR#R"RLRVRZRK(R$RLRT((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRJcs     cCsz|jj|jj|}|dk rH|j|j|j=nx?t|j|jkr|j j }|j|j|j=qKWt ||}|j |j ||j|@iN(RR tNamet from_texttsockett gethostnametdomainR0troott nameserverstsearchtportttimeouttlifetimeRtkeyringtkeynamettsigtdefault_algorithmt keyalgorithmtednst ednsflagstpayloadtcachetflagstFalsetretry_servfailtrotate(R$((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR]s$+             cCst|tst|tr[yt|d}Wntk rQdg|_dSXt}nt}z7x0|D](}t|dksk|ddksk|ddkrqkn|j }t|dkrqkn|ddkr|jj |dqk|dd kr t j j |d|_qk|dd krdx`|dD]"}|jj t j j |q;Wqk|dd krkd |dkrt|_qqkqkWWd|r|jnXt|jdkr|jj dndS( sProcess 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.trs 127.0.0.1Nit#t;t nameserveriRhRktoptionsR{(t isinstancetstrtunicodetopentIOErrorRjR:RyR0tsplitRCRR ReRhRkR{tclose(R$tft want_closetlttokenstsuffix((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRas:    2 #cCsF|jddkrd}n$|jddkr<d}nd}|S(Nt it,(tfind(R$tentryt split_char((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_determine_split_char(s   cCsat|}|j|}|j|}x0|D](}||jkr1|jj|q1q1WdS(s&Configure a NameServer registry entry.N(RRRRjRC(R$RjRtns_listtns((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_config_win32_nameservers7s   cCstjjt||_dS(s"Configure a Domain registry entry.N(RR ReRRh(R$Rh((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_config_win32_domainAscCsmt|}|j|}|j|}x<|D]4}||jkr1|jjtjj|q1q1WdS(s"Configure a Search registry entry.N(RRRRkRCRR Re(R$RkRt search_listts((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_config_win32_searchFs   cCstytj|d\}}Wntk r5d}nX|r|j|y2tj|d\}}|rz|j|nWq$tk rq$Xnytj|d\}}Wntk rd}nX|r$|j|y2tj|d\}}|r |j|nWq$tk r q$Xnytj|d\}}Wntk rYd}nX|rp|j|ndS(s%Extract DNS info from a registry key.t NameServertDomaintDhcpNameServert DhcpDomaint SearchListN(t_winregt QueryValueExt WindowsErrorRRRR(R$RLtserverstrtypetdomRk((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_config_win32_fromkeyPs<          cCsStjdtj}t}z&ytj|d}t}Wn#tk r_tj|d}nXz|j|Wd|j X|r@tj|d}zd}xtr-yltj ||}|d7}tj||}|j |||swnz|j|Wd|j XWqtk r)PqXqWWd|j XnWd|j XdS(s9Extract resolver configuration from the Windows registry.s2SYSTEM\CurrentControlSet\Services\Tcpip\Parameterss+SYSTEM\CurrentControlSet\Services\VxD\MSTCPNs=SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfacesii( RtConnectRegistryRtHKEY_LOCAL_MACHINERytOpenKeyR:tEnvironmentErrorRtClosetEnumKeyt_win32_is_nic_enabled(R$tlmt want_scant tcp_paramst interfacesR4tguidRL((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR`rs@             c Csytj|d|}ztj|d\}}|tjkrLtntj|d|}z=tj|d\}}|tjkrtn|d@ SWd|jXWd|jXWnRttfk ry&tj|d\} }| dk SWqt k r t SXnXdS(Ns]SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}\%s\Connectiont PnpInstanceIDs SYSTEM\CurrentControlSet\Enum\%st ConfigFlagsitNTEContextList( RRRtREG_SZt ValueErrort REG_DWORDRRRRRy( R$RRt interface_keytconnection_keytpnp_idtttypet device_keyRxtnte((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRs6      cCsstj}||kr:||dkr1tq:|}n||}||jkr\tnt|j||jS(Ni(R"tTimeoutRntminRm(R$tstartRDtduration((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_compute_timeouts      ic Csut|ttfr-tjj|d}nt|ttfrWtjj|}ntjj|rrt nt|ttfrtj j|}ntj j |rt ng}|j r|j |nt|dkr |j |jtjjn|jr@xC|jD]} |j |j| qWn|j |j|jt} tj} x|D]}|jr|jj|||f} | dk r| jdkr|rtq| Sqntjj|||} |jdk r| j|j|jd|jn| j|j |j!|j"|j#dk rS|j#| _#nd}|j$}|j%r|t&j'|nd}xt|dkrt|dkrt(nx|D]}|j)| }y|rtj*j+| |||j,d|d|}nytj*j-| |||j,d|d|}|j#tj#j.@rx|j)| }tj*j+| |||j,d|d|}nWnt/j0tj1j2fk rd}qnrtj*j3k rd}qnStj1j4k r|j5|d}qn't6k r|j5|d}qnX|j7}|tj7j8kr=t8n|tj7j9ksa|tj7j:krePn|tj7j;ks|j< r|j5|nd}qW|dk rPnt|dkr|j)| }t=||}|d9}tj>|qqW|j7tj7j:krqrnt?} PqrW| r1t:nt@|||||} |jrq|jjA|||f| n| S( sQuery 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.it algorithmg?itsourcet source_portiN(BRRRRR ReRRt is_metatypeR t rdataclasst is_metaclasst is_absoluteRCR0t concatenateRiRkRhR:R"RwRJRRtmessaget make_queryRptuse_tsigRoRstuse_ednsRtRuRvRxRjR{trandomtshuffleRRtqueryttcpRltudptTCRfterrort exceptionRtUnexpectedSourcet FormErrortremovetEOFErrortrcodeRtNOERRORRtSERVFAILRzRtsleepRyR RN(R$R R RRRR%Rt qnames_to_tryRt all_nxdomainRRtrequestRRjtbackoffRRmRt sleep_time((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRs"                              cCsD||_|dkr.|jjd|_n ||_||_dS(sAdd a TSIG signature to the query. @param keyring: The TSIG keyring to use; defaults to None. @type keyring: dict @param keyname: The name of the TSIG key to use; defaults to None. The key must be defined in the keyring. If a keyring is specified but a keyname is not, then the key used will be the first key in the keyring. Note that the order of keys in a dictionary is not defined, so applications should supply a keyname when a keyring is used, unless they know the keyring contains only one key. @param algorithm: The TSIG key algorithm to use. The default is dns.tsig.default_algorithm. @type algorithm: stringiN(RoRtkeysRpRs(R$RoRpR((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRs    cCs4|dkrd}n||_||_||_dS(sConfigure 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: intiN(RRtRuRv(R$RtRuRv((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRs    cCs ||_dS(sOverrides the default flags with your own @param flags: The flags to overwrite the default with @type flags: intN(Rx(R$Rx((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt set_flagssN(RRRR:R+R]RaRRRRRR`RRRRtARtINRyRRRqRrRRR(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR\s$)  &   " - 7  cCstdkrtantS(s7Get the default resolver, initializing it if necessary.N(tdefault_resolverRR\(((s2/usr/lib64/python2.7/site-packages/dns/resolver.pytget_default_resolvers  icCs"tj|||||||S(sQuery 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.(RR(R R RRRR%R((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyRs cCst|ttfr3tjj|tjj}n|dkrKt}n|j sft |nxy8|j |tj j ||}|jj|kr|SWn#tjjtjjfk rnXy|j}Wqitjjk rtqiXqidS(sFind 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.NameN(RRRRR ReRiRRRRRRRRtresolverRRRR!R (R RRRR((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt zone_for_names"    cCs|tjtjB@dkr#tn|dkrP|dkrPtjtjng}g}d}y|dkrd}|tj@dkr|jd|jdq|jd|jdnY|j d} t | dkr| d} n|} t j j | } |j||}Wny)t jj |} |j||}Wq|tj@dkry*d} |tjks|tjkrtj|t jjd t} | j}| jjt}| jdk rx$| jD]}|j|jqWqn|tjks|tjkrtj|t jjd t}|j}|jjt}|jdk rx$|jD]}|j|jqoWqnWqt jj k rtjtjqtjtj!qXqqXnXd}y%|dkrd}n t"|}Wn:|tj#@dkrGytj$|}WqCqCXqGnX|dkrhtjtjng}|dkrtj%tj&g}n |g}|tj'@dkr|}nd }|tjks|tjkr=xb|D]W} xN|D]F}x=t(|D]1}|jtj|||| |ddffqWqWqWn|tjks[|tjkrx\|D]Q} xH|D]@}x7t(|D]+}|jtj|||| |ffqWqoWqbWnt |dkrtjtjn|S( Nit localhosts::s0.0.0.0s::1s 127.0.0.1t%iR%t()Rft AI_ADDRCONFIGt AI_V4MAPPEDtNotImplementedErrorRtgaierrort EAI_NONAMEt AI_PASSIVERCRR0Rtipv6t inet_atontipv4tAI_NUMERICHOSTtAF_INET6t AF_UNSPECt _resolverRRtAAAARyR Rtto_textR:RtaddresstAF_INETRRRt EAI_SYSTEMtinttAI_NUMERICSERVt getservbynamet SOCK_DGRAMt SOCK_STREAMt AI_CANONNAMEt_protocols_for_socktype(thosttservicetfamilytsocktypetprotoRxtv6addrstv4addrsRtpartstahosttaddrR tv6trdatatv4Rlttuplest socktypestcname((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt _getaddrinfo s             !         (  "c Cs|d}|d}t|dkr<|d}tj}nd}tj}t|||tjtjd}t|dkrtjdn|ddd}|tj @rd}nd}t j j |} |tj @dkry/tj| d} | jdjjt} Wqt jjt jjfk r|tj@rVtjtjn|} |dk r| d t|7} qqXn)|} |dk r| d t|7} n|tj@rt|} ntj||} | | fS( Niiiis'sockaddr resolved to multiple addressesRRtPTRR(R0RfRRRRRtSOL_TCPRtNI_DGRAMRt reversenamet from_addresstNI_NUMERICHOSTRRRRRR:RRRt NI_NAMEREQDRRRtNI_NUMERICSERVt getservbyport( tsockaddrRxRRltscopeR RRtpnameR RthostnameR ((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt _getnameinfomsB           cCs:|dkrtj}ntt|ddddS(NiPii(RRfRgR&R(R ((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_getfqdns cCst|ddS(Nii(t_gethostbyname_ex(R ((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_gethostbynamescCstg}g}t|dtjtjtjtj}|dd}x#|D]}|j|ddqHW|||fS(Niii(RRfRRRRRC(R taliasest addressesRt canonicaltitem((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyR(s c Csy1tjj|}|dddf}tj}Wn|df}tj}nXt|tj\}}g}g}t|d|tj tj tj }|dd} x#|D]} |j | ddqW| ||fS(NiPiii( RRRRfRRR&RRRRRRC( tipRR"R R RlR*R+RR,R-((s2/usr/lib64/python2.7/site-packages/dns/resolver.pyt_gethostbyaddrs      cCsX|dkrt}n|att_tt_tt_ t t_ t t_ tt_dS(sOverride 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 N(RRRRRft getaddrinfoR&t getnameinfoR'tgetfqdnR)t gethostbynameR(tgethostbyname_exR/t gethostbyaddr(R((s2/usr/lib64/python2.7/site-packages/dns/resolver.pytoverride_system_resolvers       cCs@datt_tt_tt_t t_ t t_ t t_dS(s4Undo the effects of override_system_resolver(). 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