unsupported
  /   ˆl–Ãa¾”êh¥8 ]¸î¥1hßÁƒu–Þ_‹uÐb&=LV[(ÁÀ ¾    # Net::Domain.pm
#
# Copyright (c) 1995-1998 Graham Barr <gbarr@pobox.com>. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

package Net::Domain;

require Exporter;

use Carp;
use strict;
use vars qw($VERSION @ISA @EXPORT_OK);
use Net::Config;

@ISA       = qw(Exporter);
@EXPORT_OK = qw(hostname hostdomain hostfqdn domainname);

$VERSION = "2.20";

my ($host, $domain, $fqdn) = (undef, undef, undef);

# Try every conceivable way to get hostname.


sub _hostname {

  # we already know it
  return $host
    if (defined $host);

  if ($^O eq 'MSWin32') {
    require Socket;
    my ($name, $alias, $type, $len, @addr) = gethostbyname($ENV{'COMPUTERNAME'} || 'localhost');
    while (@addr) {
      my $a = shift(@addr);
      $host = gethostbyaddr($a, Socket::AF_INET());
      last if defined $host;
    }
    if (defined($host) && index($host, '.') > 0) {
      $fqdn = $host;
      ($host, $domain) = $fqdn =~ /^([^\.]+)\.(.*)$/;
    }
    return $host;
  }
  elsif ($^O eq 'MacOS') {
    chomp($host = `hostname`);
  }
  elsif ($^O eq 'VMS') {    ## multiple varieties of net s/w makes this hard
    $host = $ENV{'UCX$INET_HOST'}      if defined($ENV{'UCX$INET_HOST'});
    $host = $ENV{'MULTINET_HOST_NAME'} if defined($ENV{'MULTINET_HOST_NAME'});
    if (index($host, '.') > 0) {
      $fqdn = $host;
      ($host, $domain) = $fqdn =~ /^([^\.]+)\.(.*)$/;
    }
    return $host;
  }
  else {
    local $SIG{'__DIE__'};

    # syscall is preferred since it avoids tainting problems
    eval {
      my $tmp = "\0" x 256;    ## preload scalar
      eval {
        package main;
        require "syscall.ph";
        defined(&main::SYS_gethostname);
        }
        || eval {
        package main;
        require "sys/syscall.ph";
        defined(&main::SYS_gethostname);
        }
        and $host =
        (syscall(&main::SYS_gethostname, $tmp, 256) == 0)
        ? $tmp
        : undef;
      }

      # POSIX
      || eval {
      require POSIX;
      $host = (POSIX::uname())[1];
      }

      # trusty old hostname command
      || eval {
      chop($host = `(hostname) 2>/dev/null`);    # BSD'ish
      }

      # sysV/POSIX uname command (may truncate)
      || eval {
      chop($host = `uname -n 2>/dev/null`);      ## SYSV'ish && POSIX'ish
      }

      # Apollo pre-SR10
      || eval { $host = (split(/[:\. ]/, `/com/host`, 6))[0]; }

      || eval { $host = ""; };
  }

  # remove garbage
  $host =~ s/[\0\r\n]+//go;
  $host =~ s/(\A\.+|\.+\Z)//go;
  $host =~ s/\.\.+/\./go;

  $host;
}


sub _hostdomain {

  # we already know it
  return $domain
    if (defined $domain);

  local $SIG{'__DIE__'};

  return $domain = $NetConfig{'inet_domain'}
    if defined $NetConfig{'inet_domain'};

  # try looking in /etc/resolv.conf
  # putting this here and assuming that it is correct, eliminates
  # calls to gethostbyname, and therefore DNS lookups. This helps
  # those on dialup systems.

  local *RES;
  local ($_);

  if (open(RES, "/etc/resolv.conf")) {
    while (<RES>) {
      $domain = $1
        if (/\A\s*(?:domain|search)\s+(\S+)/);
    }
    close(RES);

    return $domain
      if (defined $domain);
  }

  # just try hostname and system calls

  my $host = _hostname();
  my (@hosts);

  @hosts = ($host, "localhost");

  unless (defined($host) && $host =~ /\./) {
    my $dom = undef;
    eval {
      my $tmp = "\0" x 256;    ## preload scalar
      eval {
        package main;
        require "syscall.ph";
        }
        || eval {
        package main;
        require "sys/syscall.ph";
        }
        and $dom =
        (syscall(&main::SYS_getdomainname, $tmp, 256) == 0)
        ? $tmp
        : undef;
    };

    if ($^O eq 'VMS') {
      $dom ||= $ENV{'TCPIP$INET_DOMAIN'}
        || $ENV{'UCX$INET_DOMAIN'};
    }

    chop($dom = `domainname 2>/dev/null`)
      unless (defined $dom || $^O =~ /^(?:cygwin|MSWin32)/);

    if (defined $dom) {
      my @h = ();
      $dom =~ s/^