SOLVED: (WPAD) Export Proxy Config through DHCP

[yoogie]

Hi,

how can I export additional dhcp options? I want to export a Proxy PAC file through the webserver of Captive Portal. Is that possible?

For those that are interested: http://www.ietf.org/proceedings/99nov/I-D/draft-ietf-wrec-wpad-01.txt

Regards,
Manuel

[databeestje]

use a wpad.domain.com hostname/webserver with a wpad.dat proxy pac

Enforce it using AD Group Policies
Click autodetect in the browser

[yoogie]

Well, the problem is that I don't have admin rights on the maschine using the internet connection. So I wanted to set the option 252 in dhcp (auto-proxy-config) to the proxy.pac exported by captives lighttpd.

Is it possible to set a custom option in dhcpd?

[hoba]

We currently don't support custom options besides the ones listed at services>dhcp server. Setting a prox is unfortunately not one of these options.

[yoogie]

Hi, I have integrated the automatic proxy configuration by myself. It is integrated in the gui. Feel free to adopt.

The files to edit:

• /usr/local/www/services_dhcp.php

• /etc/inc/services.inc

The modifications:

/usr/local/www/services_dhcp.php

   $pconfig['failover_peerip'] = $config['dhcpd'][$if]['failover_peerip'];
   $pconfig['netmask'] = $config['dhcpd'][$if]['netmask'];
+  $pconfig['wpad'] = $config['dhcpd'][$if]['wpad'];

   $ifcfg = $config['interfaces'][$if];

-----

		$config['dhcpd'][$if]['next-server'] = $_POST['nextserver'];
		$config['dhcpd'][$if]['filename'] = $_POST['filename'];
+		$config['dhcpd'][$if]['wpad'] = $_POST['wpad'];

		write_config();

		/* static arp configuration */
		interfaces_staticarp_configure($if);

-----

				Leave blank to disable.  Enter the REAL address of the other machine.  Machines must be using CARP.

+                      
+                        Automatic Proxy URL
+                        
+                          
+                          

+                          This is the URL to the automatic proxy script.
+			
+                      

                        Static ARP

/etc/inc/services.inc

one-lease-per-client true;
deny duplicates;

EOD;

+	if (isset($dhcpifconf['wpad'])) {
+		$dhcpdconf .= "option wpad-url code 252 = text;"."\n";
+		$dhcpdconf .= "option wpad-url \"".$dhcpifconf['wpad']."\\n\";"."\n";
+	}

	$dhcpdifs = array();

	/*    loop through and deterimine if we need to setup
	 *    failover peer "bleh" entries

With these slight modifications, there will be an extra field in the dhcp configuration where you can enter the URL to your proxy.pac. I have copied my proxy.pac to /usr/local/captiveportal/captiveportal-proxy.pac and have entered in the Automatic proxy field http://192.168.0.1:8000/captiveportal-proxy.pac.

My proxy script looks like this:

function FindProxyForURL(url, host)
{
if (
     (isPlainHostName(host)) ||
     (dnsDomainIs(host, ".dsl.local")) ||
     (isInNet(host, "10.0.0.0", "255.0.0.0")) ||
     (isInNet(host, "172.16.0.0", "255.240.0.0")) ||
     (isInNet(host, "169.254.0.0", "255.255.0.0")) ||
     (isInNet(host, "192.168.0.0", "255.255.0.0"))
   )
     return "DIRECT";

 else

if (
     (isInNet(myIpAddress(), "192.168.0.0", "255.255.255.0"))
   )
     return "PROXY 192.168.0.1:3128";
}

Cheers,
Manuel