From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastien GISLAIN <sebastien.gislain@free.fr>
To: development@lists.ipfire.org
Subject: [PATCH 1/2] Add column with resolved hostname by IP address
Date: Sat, 11 Nov 2023 10:32:03 +0100
Message-ID: <20231111093203.17013-1-sebastien.gislain@free.fr>
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From: Sebastien GISLAIN <sebastien.gislain(a)gmail.com>

---
 html/cgi-bin/dhcp.cgi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/html/cgi-bin/dhcp.cgi b/html/cgi-bin/dhcp.cgi
index f45703f0b..aabf565d7 100755
--- a/html/cgi-bin/dhcp.cgi
+++ b/html/cgi-bin/dhcp.cgi
@@ -21,6 +21,7 @@
=20
 use strict;
 use experimental 'smartmatch';
+use IO::Socket;
=20
 # enable only the following on debugging purpose
 #use warnings;
@@ -1009,6 +1010,7 @@ print <<END
 <tr>
     <th width=3D'20%' align=3D'center'><a href=3D'$ENV{'SCRIPT_NAME'}?FETHER=
'><b>$Lang::tr{'mac address'}</b></a></th>
     <th width=3D'20%' align=3D'center'><a href=3D'$ENV{'SCRIPT_NAME'}?FIPADD=
R'><b>$Lang::tr{'ip address'}</b></a></th>
+	<th width=3D'20%' align=3D'center'><b>$Lang::tr{'hostname'}</b></a></th>
     <th width=3D'15%' align=3D'center'><b>$Lang::tr{'remark'}</b></th>
     <th width=3D'15%' class=3D'boldbase' align=3D'center'><b>next-server</b>=
</th>
     <th width=3D'15%' class=3D'boldbase' align=3D'center'><b>filename</b></t=
h>
@@ -1106,9 +1108,14 @@ foreach my $line (@current2) {
 	$TAG4 =3D "class=3D'red'" if ($dhcpsettings{'KEY2'} ne $key);
     }
=20
+	# resolved name (if exists)
+	my $iaddr =3D inet_aton($temp[1]);
+	my $rname =3D gethostbyaddr($iaddr, AF_INET);
+	if (!$rname || $rname eq "") { $rname =3D $Lang::tr{'lookup failed'}; }
     print <<END
 <td align=3D'center' $col>$TAG2$temp[0]$TAG3</td>
 <td align=3D'center' $TAG4 $col>$TAG0$temp[1]$TAG1</td>
+<td align=3D'center' $col>$rname&nbsp;</td>
 <td align=3D'center' $col>$temp[6]&nbsp;</td>
 <td align=3D'center' $col>$temp[3]&nbsp;</td>
 <td align=3D'center' $col>$temp[4]&nbsp;</td>
--=20
2.39.2


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