This is libnss-myhostname. Packaged for Debian by Joachim Breitner <nomeata@debian.org>

Copyright © 2005-2011  Lennart Poettering

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation, either version 2.1 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
  General Public License for more details.


You should have received a copy of the GNU Lesser General Public License with
the Debian GNU/Linux distribution in file /usr/share/common-licenses/LGPL-2.1;
if not, write to the Free Software Foundation, Inc., 51 Franklin Street,
Fifth Floor, Boston, MA 02110-1301 USA

The debian/rules file is derived from the respective file in nss-mdns, created
by Jeff Waugh, with some additions from the debian/rules file of
libnss-extrausers, © 2001,2002,2009  Bernhard R. Link, licenced under the terms
of the GPL-2.

The debian/postinst, debian/postrm files were adapted from the files found in
the nss-mdns package, created by Jeff Waugh.