[PATCH] dhcp.cgi: Add column with resolved hostname by IP address

[PATCH] dhcp.cgi: Add column with resolved hostname by IP address

[Sebastien GISLAIN]

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In web interface, on page DHCP Server, in table Current fixed leases, add column with resolved hostname by IP address
---
 html/cgi-bin/dhcp.cgi | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/html/cgi-bin/dhcp.cgi b/html/cgi-bin/dhcp.cgi
index f45703f0b..b87da6907 100755
--- a/html/cgi-bin/dhcp.cgi
+++ b/html/cgi-bin/dhcp.cgi
@@ -21,6 +21,7 @@
 
 use strict;
 use experimental 'smartmatch';
+use IO::Socket;
 
 # enable only the following on debugging purpose
 #use warnings;
@@ -1007,8 +1008,9 @@ END
 print <<END
 <table width='100%' class='tbl'>
 <tr>
-    <th width='20%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FETHER'><b>$Lang::tr{'mac address'}</b></a></th>
-    <th width='20%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FIPADDR'><b>$Lang::tr{'ip address'}</b></a></th>
+    <th width='15%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FETHER'><b>$Lang::tr{'mac address'}</b></a></th>
+    <th width='10%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FIPADDR'><b>$Lang::tr{'ip address'}</b></a></th>
+    <th width='15%' align='center'><b>$Lang::tr{'hostname'}</b></th>
     <th width='15%' align='center'><b>$Lang::tr{'remark'}</b></th>
     <th width='15%' class='boldbase' align='center'><b>next-server</b></th>
     <th width='15%' class='boldbase' align='center'><b>filename</b></th>
@@ -1106,9 +1108,14 @@ foreach my $line (@current2) {
 	$TAG4 = "class='red'" if ($dhcpsettings{'KEY2'} ne $key);
     }
 
+	# resolved name (if exists)
+	my $iaddr = inet_aton($temp[1]);
+	my $rname = gethostbyaddr($iaddr, AF_INET);
+	if (!$rname || $rname eq "") { $rname = $Lang::tr{'ptr lookup failed'}; }
     print <<END
 <td align='center' $col>$TAG2$temp[0]$TAG3</td>
 <td align='center' $TAG4 $col>$TAG0$temp[1]$TAG1</td>
+<td align='center' $col>$rname&nbsp;</td>
 <td align='center' $col>$temp[6]&nbsp;</td>
 <td align='center' $col>$temp[3]&nbsp;</td>
 <td align='center' $col>$temp[4]&nbsp;</td>
-- 
2.39.2

Re: [PATCH] dhcp.cgi: Add column with resolved hostname by IP address

[Peter Müller]

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Hello Sebastien,

and thank you for this patch. Looks good to me; it will land in Core
Update 182. Keep these coming, appreciated! :-)

Reviewed-by: Peter Müller <peter.mueller(a)ipfire.org>

Thanks, and best regards,
Peter Müller

> In web interface, on page DHCP Server, in table Current fixed leases, add column with resolved hostname by IP address
> ---
>  html/cgi-bin/dhcp.cgi | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/html/cgi-bin/dhcp.cgi b/html/cgi-bin/dhcp.cgi
> index f45703f0b..b87da6907 100755
> --- a/html/cgi-bin/dhcp.cgi
> +++ b/html/cgi-bin/dhcp.cgi
> @@ -21,6 +21,7 @@
>  
>  use strict;
>  use experimental 'smartmatch';
> +use IO::Socket;
>  
>  # enable only the following on debugging purpose
>  #use warnings;
> @@ -1007,8 +1008,9 @@ END
>  print <<END
>  <table width='100%' class='tbl'>
>  <tr>
> -    <th width='20%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FETHER'><b>$Lang::tr{'mac address'}</b></a></th>
> -    <th width='20%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FIPADDR'><b>$Lang::tr{'ip address'}</b></a></th>
> +    <th width='15%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FETHER'><b>$Lang::tr{'mac address'}</b></a></th>
> +    <th width='10%' align='center'><a href='$ENV{'SCRIPT_NAME'}?FIPADDR'><b>$Lang::tr{'ip address'}</b></a></th>
> +    <th width='15%' align='center'><b>$Lang::tr{'hostname'}</b></th>
>      <th width='15%' align='center'><b>$Lang::tr{'remark'}</b></th>
>      <th width='15%' class='boldbase' align='center'><b>next-server</b></th>
>      <th width='15%' class='boldbase' align='center'><b>filename</b></th>
> @@ -1106,9 +1108,14 @@ foreach my $line (@current2) {
>  	$TAG4 = "class='red'" if ($dhcpsettings{'KEY2'} ne $key);
>      }
>  
> +	# resolved name (if exists)
> +	my $iaddr = inet_aton($temp[1]);
> +	my $rname = gethostbyaddr($iaddr, AF_INET);
> +	if (!$rname || $rname eq "") { $rname = $Lang::tr{'ptr lookup failed'}; }
>      print <<END
>  <td align='center' $col>$TAG2$temp[0]$TAG3</td>
>  <td align='center' $TAG4 $col>$TAG0$temp[1]$TAG1</td>
> +<td align='center' $col>$rname&nbsp;</td>
>  <td align='center' $col>$temp[6]&nbsp;</td>
>  <td align='center' $col>$temp[3]&nbsp;</td>
>  <td align='center' $col>$temp[4]&nbsp;</td>