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[Bug network/15218] New: getaddrinfo uses PTR records for canonname if address family specified


http://sourceware.org/bugzilla/show_bug.cgi?id=15218

             Bug #: 15218
           Summary: getaddrinfo uses PTR records for canonname if address
                    family specified
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: ghudson@mit.edu
    Classification: Unclassified


Created attachment 6909
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6909
Test program demonstrating getaddrinfo issue

With today's master, getaddrinfo with AI_CANONNAME yields the right
ai_canonname (the result of CNAME resolution but not PTR lookup) if no other
hint fields are given.  However, if hint.ai_family is set to INET6, it appears
to do a PTR lookup.  The attached test program demonstrates the problem (the
first and third output lines in particular):

$ ./a.out ptr-mismatch.kerberos.org
AI_CANONNAME alone: www.kerberos.org
AI_ADDRCONFIG also: www.kerberos.org
ai_family AF_INET : KERBEROS-ORG.MIT.EDU
ai_family AF_INET6: Name or service not known

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