pfSense

function get_interface_info($ifdescr) {

	global $config, $linkinfo, $netstatrninfo;

	$ifinfo = array();

	/* find out interface name */

	$ifinfo['hwif'] = $config['interfaces'][$ifdescr]['if'];

	if ($ifdescr == "wan")

		$ifinfo['if'] = get_real_wan_interface();

	else

		$ifinfo['if'] = $ifinfo['hwif'];

	/* run netstat to determine link info */

	unset($linkinfo);

	exec("/usr/bin/netstat -I " . $ifinfo['hwif'] . " -nWb -f link", $linkinfo);

	$linkinfo = preg_split("/\s+/", $linkinfo[1]);

	if (preg_match("/\*$/", $linkinfo[0])) {

		$ifinfo['status'] = "down";

	} else {

		$ifinfo['status'] = "up";

	}

	/* PPPoE interface? -> get status from virtual interface */

	if (($ifdescr == "wan") && ($config['interfaces']['wan']['ipaddr'] == "pppoe")) {

		unset($linkinfo);

		exec("/usr/bin/netstat -I " . $ifinfo['if'] . " -nWb -f link", $linkinfo);

		$linkinfo = preg_split("/\s+/", $linkinfo[1]);

		if (preg_match("/\*$/", $linkinfo[0])) {

			$ifinfo['pppoelink'] = "down";

		} else {

			/* get PPPoE link status for dial on demand */

			$ifconfiginfo = "";

			unset($ifconfiginfo);

			exec("/sbin/ifconfig " . $ifinfo['if'], $ifconfiginfo);

			$ifinfo['pppoelink'] = "up";

			foreach ($ifconfiginfo as $ici) {

				if (strpos($ici, 'LINK0') !== false)

					$ifinfo['pppoelink'] = "down";

			}

		}

	}

	/* PPTP interface? -> get status from virtual interface */

	if (($ifdescr == "wan") && ($config['interfaces']['wan']['ipaddr'] == "pptp")) {

		unset($linkinfo);

		exec("/usr/bin/netstat -I " . $ifinfo['if'] . " -nWb -f link", $linkinfo);

		$linkinfo = preg_split("/\s+/", $linkinfo[1]);

		if (preg_match("/\*$/", $linkinfo[0])) {

			$ifinfo['pptplink'] = "down";

		} else {

			/* get PPTP link status for dial on demand */

			unset($ifconfiginfo);

			exec("/sbin/ifconfig " . $ifinfo['if'], $ifconfiginfo);

			$ifinfo['pptplink'] = "up";

			foreach ($ifconfiginfo as $ici) {

				if (strpos($ici, 'LINK0') !== false)

					$ifinfo['pptplink'] = "down";

			}

		}

	}

	if ($ifinfo['status'] == "up") {

		/* try to determine media with ifconfig */

		$matches = "";

		if ($ifinfo['pppoelink'] != "down" && $ifinfo['pptplink'] != "down") {

			/* try to determine IP address and netmask with ifconfig */

			unset($ifconfiginfo);

			exec("/sbin/ifconfig " . $ifinfo['if'], $ifconfiginfo);

			foreach ($ifconfiginfo as $ici) {

				if (preg_match("/inet (\S+)/", $ici, $matches)) {

					$ifinfo['ipaddr'] = $matches[1];

				}

				if (preg_match("/netmask (\S+)/", $ici, $matches)) {

					if (preg_match("/^0x/", $matches[1]))

						$ifinfo['subnet'] = long2ip(hexdec($matches[1]));

				}

			}

			if ($ifdescr == "wan") {

				/* run netstat to determine the default gateway */

				unset($netstatrninfo);

				exec("/usr/bin/netstat -rnf inet", $netstatrninfo);

				foreach ($netstatrninfo as $nsr) {

					if (preg_match("/^default\s*(\S+)/", $nsr, $matches)) {

						$ifinfo['gateway'] = $matches[1];

					}

				}

			} else {

				/* deterimine interface gateway */

				$int = convert_friendly_interface_to_real_interface_name($ifdescr);

				$gw = get_interface_gateway($int);

				if($gw)

					$ifinfo['gateway'] = $gw;

			}

		}

	}

	return $ifinfo;

}