[Bug network/16475] New: gethostbyaddr without /etc/{resolv,nsswitch}.conf

["ludo at gnu dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16475

            Bug ID: 16475
           Summary: gethostbyaddr without /etc/{resolv,nsswitch}.conf
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: ludo at gnu dot org

(Initially discussed at
<http://sourceware.org/ml/libc-alpha/2014-01/msg00351.html>.)

Consider an environment without /etc/resolv.conf.

When doing a host name lookup, âdnsâ returns NSS_STATUS_UNAVAIL, so we go on
with âfilesâ and /etc/hosts is honored as expected

Conversely, when doing a reverse lookup when /etc/resolv.conf is missing, the
'dns' name service returns NSS_STATUS_NOTFOUND, leading 'gethostbyaddr' to
return immediately without invoking the 'files' NSS (thus ignoring /etc/hosts.)

It seems that 'dns' should instead always return UNAVAIL when resolv.conf is
missing, but that is an ABI break.

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