Sync with libnet-1.12

[perl5.git] / lib / Net / Domain.pm

diff --git a/lib/Net/Domain.pm b/lib/Net/Domain.pm
index c1b0140..b79ec8f 100644 (file)
--- a/lib/Net/Domain.pm
+++ b/lib/Net/Domain.pm
@@ -16,7 +16,7 @@ use Net::Config;
 @ISA = qw(Exporter);
 @EXPORT_OK = qw(hostname hostdomain hostfqdn domainname);
 
-$VERSION = "2.13"; # $Id: //depot/libnet/Net/Domain.pm#10 $
+$VERSION = "2.17"; # $Id: //depot/libnet/Net/Domain.pm#19 $
 
 my($host,$domain,$fqdn) = (undef,undef,undef);
 
@@ -36,8 +36,8 @@ sub _hostname {
           my $a = shift(@addr);
           $host = gethostbyaddr($a,Socket::AF_INET());
           last if defined $host;
-         } 
-        if (index($host,'.') > 0) {
+         }
+        if (defined($host) && index($host,'.') > 0) {
            $fqdn = $host;
            ($host,$domain) = $fqdn =~ /^([^\.]+)\.(.*)$/;
          }
@@ -101,8 +101,8 @@ sub _hostname {
            $host = "";
        };
     }
- 
-    # remove garbage 
+
+    # remove garbage
     $host =~ s/[\0\r\n]+//go;
     $host =~ s/(\A\.+|\.+\Z)//go;
     $host =~ s/\.\.+/\./go;
@@ -127,6 +127,7 @@ sub _hostdomain {
     # those on dialup systems.
 
     local *RES;
+    local($_);
 
     if(open(RES,"/etc/resolv.conf")) {
        while(<RES>) {
@@ -143,11 +144,10 @@ sub _hostdomain {
 
     my $host = _hostname();
     my(@hosts);
-    local($_);
 
     @hosts = ($host,"localhost");
 
-    unless($host =~ /\./) {
+    unless (defined($host) && $host =~ /\./) {
        my $dom = undef;
         eval {
            my $tmp = "\0" x 256; ## preload scalar
@@ -165,7 +165,7 @@ sub _hostdomain {
         };
 
        chop($dom = `domainname 2>/dev/null`)
-               unless(defined $dom);
+               unless(defined $dom || $^O =~ /^(?:cygwin|MSWin32)/);
 
        if(defined $dom) {
            my @h = ();
@@ -179,19 +179,19 @@ sub _hostdomain {
 
     # Attempt to locate FQDN
 
-    foreach (@hosts) {
+    foreach (grep {defined $_} @hosts) {
        my @info = gethostbyname($_);
 
        next unless @info;
 
        # look at real name & aliases
        my $site;
-       foreach $site ($info[0], split(/ /,$info[1])) { 
+       foreach $site ($info[0], split(/ /,$info[1])) {
            if(rindex($site,".") > 0) {
 
                # Extract domain from FQDN
 
-               ($domain = $site) =~ s/\A[^\.]+\.//; 
+               ($domain = $site) =~ s/\A[^\.]+\.//;
                return $domain;
            }
        }
@@ -199,7 +199,7 @@ sub _hostdomain {
 
     # Look for environment variable
 
-    $domain ||= $ENV{LOCALDOMAIN} ||= $ENV{DOMAIN} || undef;
+    $domain ||= $ENV{LOCALDOMAIN} || $ENV{DOMAIN};
 
     if(defined $domain) {
        $domain =~ s/[\r\n\0]+//g;
@@ -224,19 +224,20 @@ sub domainname {
     # eleminate DNS lookups
 
     return $fqdn = $host . "." . $domain
-       if($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 $host =~ /^\d+(\.\d+){3}$/;
+    return $fqdn = $host if defined $host and $host =~ /^\d+(\.\d+){3}$/;
 
-    my @host   = split(/\./, $host);
-    my @domain = split(/\./, $domain);
+    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;
@@ -328,4 +329,8 @@ Copyright (c) 1995-1998 Graham Barr. All rights reserved.
 This program is free software; you can redistribute it and/or modify
 it under the same terms as Perl itself.
 
+=for html <hr>
+
+I<$Id: //depot/libnet/Net/Domain.pm#19 $>
+
 =cut