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File / Folder	Size	Action
.	-
DNS	--	ren
FTP	--	ren
HTTP	--	ren
Cmd.pm	20.525KB	edt ren
Config.pm	8.665KB	edt ren
DNS.pm	18.058KB	edt ren
Domain.pm	8.575KB	edt ren
FTP.pm	51.474KB	edt ren
HTTP.pm	9.715KB	edt ren
HTTPS.pm	3.091KB	edt ren
NNTP.pm	32.679KB	edt ren
Netrc.pm	8.014KB	edt ren
POP3.pm	21.086KB	edt ren
Ping.pm	82.054KB	edt ren
SMTP.pm	28.467KB	edt ren
Time.pm	4.158KB	edt ren
hostent.pm	3.898KB	edt ren
netent.pm	4.273KB	edt ren
protoent.pm	2.852KB	edt ren
servent.pm	3.298KB	edt ren

# Net::Domain.pm
#
# Copyright (C) 1995-1998 Graham Barr.  All rights reserved.
# Copyright (C) 2013-2014, 2020 Steve Hay.  All rights reserved.
# This module is free software; you can redistribute it and/or modify it under
# the same terms as Perl itself, i.e. under the terms of either the GNU General
# Public License or the Artistic License, as specified in the F<LICENCE> file.

package Net::Domain;

use 5.008001;

use strict;
use warnings;

use Carp;
use Exporter;
use Net::Config;

our @ISA       = qw(Exporter);
our @EXPORT_OK = qw(hostname hostdomain hostfqdn domainname);
our $VERSION = "3.15";

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"; ## no critic (Modules::RequireBarewordIncludes)
        defined(&main::SYS_gethostname);
        }
        || eval {
        package main;
        require "sys/syscall.ph"; ## no critic (Modules::RequireBarewordIncludes)
        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 ($_);

if (open(my $res, '<', "/etc/resolv.conf")) {
    while (<$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"; ## no critic (Modules::RequireBarewordIncludes)
        }
        || eval {
        package main;
        require "sys/syscall.ph"; ## no critic (Modules::RequireBarewordIncludes)
        }
        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|android)/);

if (defined $dom) {
      my @h = ();
      $dom =~ s/^\.+//;
      while (length($dom)) {
        push(@h, "$host.$dom");
        $dom =~ s/^[^.]+.+// or last;
      }
      unshift(@hosts, @h);
    }
  }

# Attempt to locate FQDN

foreach (grep { defined $_ } @hosts) {
    my @info = gethostbyname($_);

next unless @info;

# look at real name & aliases
    foreach my $site ($info[0], split(/ /, $info[1])) {
      if (rindex($site, ".") > 0) {

# Extract domain from FQDN

($domain = $site) =~ s/\A[^.]+\.//;
        return $domain;
      }
    }
  }

# Look for environment variable

$domain ||= $ENV{LOCALDOMAIN} || $ENV{DOMAIN};

if (defined $domain) {
    $domain =~ s/[\r\n\0]+//g;
    $domain =~ s/(\A\.+|\.+\Z)//g;
    $domain =~ s/\.\.+/\./g;
  }

$domain;
}

sub domainname {

return $fqdn
    if (defined $fqdn);

_hostname();

# *.local names are special on darwin. If we call gethostbyname below, it
  # may hang while waiting for another, non-existent computer to respond.
  if($^O eq 'darwin' && $host =~ /\.local$/) {
    return $host;
  }

_hostdomain();

# Assumption: If the host name does not contain a period
  # and the domain name does, then assume that they are correct
  # this helps to eliminate calls to gethostbyname, and therefore
  # eliminate DNS lookups

return $fqdn = $host . "." . $domain
    if (defined $host
    and defined $domain
    and $host !~ /\./
    and $domain =~ /\./);

# For hosts that have no name, just an IP address
  return $fqdn = $host if defined $host and $host =~ /^\d+(\.\d+){3}$/;

my @host   = defined $host   ? split(/\./, $host)   : ('localhost');
  my @domain = defined $domain ? split(/\./, $domain) : ();
  my @fqdn   = ();

# Determine from @host & @domain the FQDN

my @d = @domain;

LOOP:
  while (1) {
    my @h = @host;
    while (@h) {
      my $tmp = join(".", @h, @d);
      if ((gethostbyname($tmp))[0]) {
        @fqdn = (@h, @d);
        $fqdn = $tmp;
        last LOOP;
      }
      pop @h;
    }
    last unless shift @d;
  }

if (@fqdn) {
    $host = shift @fqdn;
    until ((gethostbyname($host))[0]) {
      $host .= "." . shift @fqdn;
    }
    $domain = join(".", @fqdn);
  }
  else {
    undef $host;
    undef $domain;
    undef $fqdn;
  }

$fqdn;
}

sub hostfqdn { domainname() }

sub hostname {
  domainname()
    unless (defined $host);
  return $host;
}

sub hostdomain {
  domainname()
    unless (defined $domain);
  return $domain;
}

1;    # Keep require happy

__END__

=head1 NAME

Net::Domain - Attempt to evaluate the current host's internet name and domain

=head1 SYNOPSIS

use Net::Domain qw(hostname hostfqdn hostdomain domainname);

=head1 DESCRIPTION

Using various methods B<attempt> to find the Fully Qualified Domain Name (FQDN)
of the current host. From this determine the host-name and the host-domain.

Each of the functions will return I<undef> if the FQDN cannot be determined.

=head2 Functions

=over 4

=item C<hostfqdn()>

Identify and return the FQDN of the current host.

=item C<domainname()>

An alias for hostfqdn().

=item C<hostname()>

Returns the smallest part of the FQDN which can be used to identify the host.

=item C<hostdomain()>

Returns the remainder of the FQDN after the I<hostname> has been removed.

=back

=head1 EXPORTS

The following symbols are, or can be, exported by this module:

=over 4

=item Default Exports

I<None>.

=item Optional Exports

C<hostname>,
C<hostdomain>,
C<hostfqdn>,
C<domainname>.

=item Export Tags

I<None>.

=back

=head1 KNOWN BUGS

See L<https://rt.cpan.org/Dist/Display.html?Status=Active&Queue=libnet>.

=head1 AUTHOR

Graham Barr E<lt>L<gbarr@pobox.com|mailto:gbarr@pobox.com>E<gt>.

Adapted from Sys::Hostname by David Sundstrom
E<lt>L<sunds@asictest.sc.ti.com|mailto:sunds@asictest.sc.ti.com>E<gt>.

Steve Hay E<lt>L<shay@cpan.org|mailto:shay@cpan.org>E<gt> is now maintaining
libnet as of version 1.22_02.

=head1 COPYRIGHT

=head1 LICENCE

This module is free software; you can redistribute it and/or modify it under the
same terms as Perl itself, i.e. under the terms of either the GNU General Public
License or the Artistic License, as specified in the F<LICENCE> file.

=head1 VERSION

Version 3.15

=head1 DATE

20 March 2023

=head1 HISTORY

See the F<Changes> file.

=cut