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[Bug libc/4980] New: gethostbyname() etc break for /etc/hosts with both ::1 and 127.0.0.1 localhost entries


On Nov 20 a change in nss/nss_files/files-hosts.c:LINE_PARSER was
introduced to treat ::1 the same way as 127.0.0.1. A lot of Linux systems have

        127.0.0.1       localhost
        ::1             localhost

in their /etc/hosts (though most have ip6-localhost for ::1 instead).

The new behavior appears not to be mandated by any standard nor does it seem as
a particularily useful change.

The trouble is that now gethostbyname() (gethostbyname2(), getaddrinfo(), ...)
will return duplicate 127.0.0.1 records in h_addr_list[] and some applications
do not explect duplicate entries in this array (e.g. OpenLDAP). The new
behaviour does not seem to gain anything so the old behavior should be restored.

-- 
           Summary: gethostbyname() etc break for /etc/hosts with both ::1
                    and 127.0.0.1 localhost entries
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: pasky at suse dot cz
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4980

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