Display rDNS/PTR record and GeoIP information for used nameservers
on the netexternal.cgi WebUI page. These information might be useful
for debugging.

Thanks to Matthias Fischer for style improvements.

Signed-off-by: Peter Müller <peter.mueller(a)link38.eu>
---
 html/cgi-bin/netexternal.cgi | 25 +++++++++++++++++++++++++
 langs/de/cgi-bin/de.pl       |  1 +
 langs/en/cgi-bin/en.pl       |  1 +
 3 files changed, 27 insertions(+)

diff --git a/html/cgi-bin/netexternal.cgi b/html/cgi-bin/netexternal.cgi
index 299612d4c..cd2223ac6 100644
--- a/html/cgi-bin/netexternal.cgi
+++ b/html/cgi-bin/netexternal.cgi
@@ -25,9 +25,13 @@ use strict;
 #use warnings;
 #use CGI::Carp 'fatalsToBrowser';
 
+use IO::Socket;
+use Geo::IP::PurePerl;
+
 require '/var/ipfire/general-functions.pl';
 require "${General::swroot}/lang.pl";
 require "${General::swroot}/header.pl";
+require "${General::swroot}/geoip-functions.pl";
 require "${General::swroot}/graphs.pl";
 
 my %color = ();
@@ -99,6 +103,12 @@ if ( $querry[0] ne~ ""){
 						<strong>$Lang::tr{'nameserver'}</strong>
 					</th>
 					<th align="center">
+						<strong>$Lang::tr{'flag'}</strong>
+					</th>
+					<th align="center">
+						<strong>$Lang::tr{'rdns'}</strong>
+					</th>
+					<th align="center">
 						<strong>$Lang::tr{'status'}</strong>
 					</th>
 				</tr>
@@ -138,10 +148,25 @@ END
 		}
 
 		my $table_colour = ($id++ % 2) ? $color{'color22'} : $color{'color20'};
+		
+		my $iaddr = inet_aton($nameserver);
+		my $rdns = gethostbyaddr($iaddr, AF_INET);
+		if (!$rdns) { $rdns = $Lang::tr{'lookup failed'}; }
+
+		my $gi = Geo::IP::PurePerl->new();
+		my $ccode = $gi->country_code_by_name($nameserver);
+		my $fcode = lc($ccode);
+		my $flag_icon = &GeoIP::get_flag_icon($fcode);
 
 		print <<END;
 			<tr bgcolor="$table_colour">
 				<td>$nameserver</td>
+				<td align="center">
+					<a href="country.cgi#$fcode"><img src="$flag_icon" border="0" align="absmiddle" alt="$ccode" title="$ccode"></a>
+				</td>
+				<td align="center">
+					$rdns
+				</td>
 				<td bgcolor="$bgcolour" align="center">
 					<font color="$colour"><strong>$message</strong></font>
 				</td>
diff --git a/langs/de/cgi-bin/de.pl b/langs/de/cgi-bin/de.pl
index af96a6445..4cf866a3a 100644
--- a/langs/de/cgi-bin/de.pl
+++ b/langs/de/cgi-bin/de.pl
@@ -1951,6 +1951,7 @@
 'quick playlist' => 'Quick Playlist',
 'ram' => 'RAM-Speicher',
 'random number generator daemon' => 'Random Number Generator Daemon',
+'rdns' => 'rDNS',
 'read bytes' => 'Gelesene Bytes',
 'read list' => 'Liste der Leseberechtigten',
 'real address' => 'Reale Addresse',
diff --git a/langs/en/cgi-bin/en.pl b/langs/en/cgi-bin/en.pl
index 7e4f95ccf..946aba873 100644
--- a/langs/en/cgi-bin/en.pl
+++ b/langs/en/cgi-bin/en.pl
@@ -1989,6 +1989,7 @@
 'quick playlist' => 'Quick Playlist',
 'ram' => 'RAM',
 'random number generator daemon' => 'Random Number Generator Daemon',
+'rdns' => 'rDNS',
 'read bytes' => 'Read Bytes',
 'read list' => 'list with readonly hosts',
 'real address' => 'Real Address',
-- 
2.13.6