NAME

  Sys::Hostname::FQDN - Get the short or long hostname

SYNOPSIS

  use Sys::Hostname::FQDN qw(
        asciihostinfo
        gethostinfo
        inet_ntoa
        inet_aton
        fqdn
        short
  );

  $host = short();
  $fqdn = fqdn();
  ($name,$aliases,$addrtype,$length,@addrs)=gethostinfo();
  ($name,$aliases,$addrtype,$length,@addrs)=asciihostinfo();
  $dotquad = inet_ntoa($netaddr);
  $netaddr = inet_aton($dotquad);

INSTALLATION

To install this module type the following:

  perl Makefile.PL
  make
  make test
  make install

Solaris users, see the 'hints' subdirectory if you have problems with the build.

DESCRIPTION

Sys::Hostname::FQDN uses the host 'C' library to discover the (usually) short host name, then uses (perl) gethostbyname to extract the real hostname.

The results from gethostbyname are exported as gethostinfo and asciihostinfo as a convenience since they are available. Similarly, the 'C' library functions inet_ntoa and inet_aton are exported.

$host = short();

  returns the host part of this host's FQDN.

$fqdn = fqdn();

  returns the fully qualified host name of this host.

($name,$aliases,$addrtype,$length,@addrs)=gethostinfo();

  returns:
    $name       fully qualifed host name of this host.
    $aliases    alternate names for this host.
    $addrtype   The type of address; always AF_INET at present.
    $length     The length of the address in bytes.
    @addrs      array of network addresses for this host 
                in network byte order.

($name,$aliases,$addrtype,$length,@addrs)=asciihostinfo();

  returns:
    $name       fully qualifed host name of this host.
    $aliases    alternate names for this host.
    $addrtype   The type of address; always AF_INET at present.
    $length     The length of the address in bytes.
    @addrs      array of dot quad IP addresses for this host.

$dotquad = inet_ntoa($netaddr);

  input:        packed network address in network byte order.
  returns:      dot quad IP address.

$netaddr = inet_aton($dotquad);

  input:        dot quad IP address.
  returns:      packed network address in network byte order.

DEPENDENCIES

  none

EXPORT

  None by default

EXPORT_OK

  asciihostinfo
  gethostinfo
  inet_ntoa
  inet_aton
  fqdn
  short

ACKNOWLEDGEMENTS

The workaround for systems that do not have 'inet_aton' is taken directly from Socket.xs in the Perl 5 kit for perl-5.8.0 by Larry Wall, copyright 1989-2002. Thank you Larry for making PERL possible for all of us.

AUTHOR

Michael Robinton <michael@bizsystems.com>

COPYRIGHT AND LICENCE

  Copyright 2003, Michael Robinton <michael@bizsystems.com>
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.