o i$ @sPdZddlZddlmZddlmZmZmZddlm Z ddl m Z ddl m Z mZmZmZmZmZed\ZZZd ZeejGd d d Zd&d dZie jde jde jde jde jde j de j!de j"de j#de j$de j%de j&de j'de j(de j)de j*de j+de j,d e j-d!e j.d"e j/d#e j0d$e j1d%iZ2dS)'z> Base functionality useful to various parts of Twisted Names. N) implementer)defererror interfaces)Logger)dns)DNSFormatError DNSNameErrorDNSNotImplementedErrorDNSQueryRefusedErrorDNSServerErrorDNSUnknownError)rrc @sVeZdZdZeZejeej e ej e ej eejeiZdZddZddZd>ddZd d Zd>d d Zd>d dZd>ddZd>ddZd>ddZd>ddZd>ddZd>ddZd>ddZd>ddZ d>dd Z!d>d!d"Z"d>d#d$Z#d>d%d&Z$d>d'd(Z%d>d)d*Z&d>d+d,Z'd>d-d.Z(d>d/d0Z)d>d1d2Z*d>d3d4Z+d>d5d6Z,d>d7d8Z-d?d:d;Z.d|jtj kr>ttj|jj Sq&|D]}|jkrY|jtj krYttj |jj SqA|D],}|jkr|jtj krt||jj|d}|s|j|jjjddS|Sq\|D]1}|jtjkrqddlm}|j|jjjdtjfgdfd d }j|SdS) am Resolve a name to an IP address, following I{CNAME} records and I{NS} referrals recursively. This is an implementation detail of L{ResolverBase.getHostByName}. @param resolver: The resolver to use for the next query (unless handling an I{NS} referral). @type resolver: L{IResolver} @param name: The name being looked up. @type name: L{dns.Name} @param answers: All of the records returned by the previous query (answers, authority, and additional concatenated). @type answers: L{list} of L{dns.RRHeader} @param level: Remaining recursion budget. This is decremented at each recursion. The query returns L{None} when it reaches 0. @type level: L{int} @returns: The first IPv4 or IPv6 address (as a dotted quad or colon quibbles), or L{None} when no result is found. @rtype: native L{str} or L{None} N inet_ntop)r_r)clientascii)Zserverscs$|\}}}t|||dS)Nrn)rb)rdrerfrglevelr#Z nsResolverrr queryAgains z!extractRecord..queryAgain)hasattrsocketr#rrr2rmAF_INET6payloadaddressr0r,AF_INETr8rbrar6 twisted.namesroResolverdecodeZPORTr.r])resolverr#ZanswersrrrrhrorsrrqrrbsB   rbr.r1r3r7r9rCr;r=r?rErGrArKrMr5rOrQrSrUrIrYrWr[)r\)3rlruZzope.interfacerZtwisted.internetrrrZtwisted.loggerrrzrZtwisted.names.errorrr r r r r rangeZ_ANSZ_AUTHZ_ADDZ EMPTY_RESULTZ IResolverrrbr,r0r2r6r8rBr:r<r>rDrFr@rJrLr4rNrPrRrTrHrXrVrZrrrrrsn      B