[Bug nscd/13375] New: nscd inhibits HOSTALIASES envvar

[Bug nscd/13375] New: nscd inhibits HOSTALIASES envvar

[matz at suse dot de]

http://sourceware.org/bugzilla/show_bug.cgi?id=13375

             Bug #: 13375
           Summary: nscd inhibits HOSTALIASES envvar
           Product: glibc
           Version: 2.14
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nscd
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: matz@suse.de
    Classification: Unclassified


Make sure nscd is running and indeed caching hosts database lookups (not the
case with debian for instance), then:

% HOSTALIASES=./fooalias strace getent hosts bla 2>&1 | grep fooalias

shows that the file isn't accessed.  It is accessed if nscd isn't running
(and in that case is correctly interpreted).  getent is just a convenient
shorthand for a testcase, the gethostbyname interface behaves the same,
i.e. doesn't lookup HOSTALIASES files when nscd is running.  But according
to the manpage it should.  I think it's an extension, not POSIX behaviour,
but one side needs to be fixed, either docu or code.

FWIW, the environment variable isn't respected because res_hostalias
isn't called, because __libc_res_nquery isn't called, because the
nscd-accessing routines are called first.

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[Bug nscd/13375] nscd inhibits HOSTALIASES envvar

[matz at suse dot de]

http://sourceware.org/bugzilla/show_bug.cgi?id=13375

--- Comment #1 from Michael Matz <matz at suse dot de> 2011-11-02 15:38:17 UTC ---
Oh, for reference, this came in as
  https://bugzilla.novell.com/show_bug.cgi?id=727360 .

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[Bug nscd/13375] nscd inhibits HOSTALIASES envvar

[brian.cain at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13375

brian.cain at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |brian.cain at gmail dot com

--- Comment #2 from brian.cain at gmail dot com 2011-11-15 19:16:29 UTC ---
I can confirm that disabling nscd does indeed workaround the problem.  If this
is the expected behavior, is there another environment-variable style override
to bypass nscd lookup, similar to HOSTALIASES?

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[Bug nscd/13375] nscd inhibits HOSTALIASES envvar

[schwab@linux-m68k.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13375

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|drepper.fsp at gmail dot    |unassigned at sourceware
                   |com                         |dot org

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[Bug nscd/13375] nscd inhibits HOSTALIASES envvar

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13375

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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