pfSense

<?php

/****h* pfSense/config

 * NAME

 *   config.inc - Functions to manipulate config.xml

 * DESCRIPTION

 *   This include contains various config.xml specific functions.

 * HISTORY

 * $Id$

 ******

	config.lib.inc

	Ported from config.inc by Erik Kristensen

	Copyright (C) 2004-2006 Scott Ullrich

	All rights reserved.

	originally part of m0n0wall (http://m0n0.ch/wall)

	Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>.

	All rights reserved.

	Redistribution and use in source and binary forms, with or without

	modification, are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice,

	   this list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright

	   notice, this list of conditions and the following disclaimer in the

	   documentation and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,

	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

	AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,

	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

	POSSIBILITY OF SUCH DAMAGE.

	pfSense_BUILDER_BINARIES:	/sbin/mount	/sbin/sysctl	/sbin/umount	/sbin/halt	/sbin/fsck	/bin/sync

	pfSense_MODULE:	config

*/

/****f* config/encrypted_configxml

 * NAME

 *   encrypted_configxml - Checks to see if config.xml is encrypted and if so, prompts to unlock.

 * INPUTS

 *   None

 * RESULT

 *   $config 	- rewrites config.xml without encryption

 ******/

function encrypted_configxml() {

	global $g, $config;

	if(file_exists($g['conf_path'] . "/config.xml")) {

		if($g['booting']) {

			$configtxt = file_get_contents($g['conf_path'] . "/config.xml");			

			if(tagfile_deformat($configtxt, $configtxt, "config.xml")) {

				$fp = fopen('php://stdin', 'r');

				$data = "";

				echo "\n\n*** Encrypted config.xml detected ***\n";

				while($data == "") {

					echo "\nEnter the password to decrypt config.xml: ";

					$decrypt_password = chop(fgets($fp));

					$data = decrypt_data($configtxt, $decrypt_password);

					if(!strstr($data, "<pfsense>"))

						$data = "";

					if($data) {

						$fd = fopen($g['conf_path'] . "/config.xml", "w");

						fwrite($fd, $data);

						fclose($fd);

						echo "\nConfig.xml unlocked.\n";

						fclose($fp);

					} else {

						echo "\nInvalid password entered.  Please try again.\n";

					}

				}

			}

		}

	}

}

/****f* config/parse_config

 * NAME

 *   parse_config - Read in config.cache or config.xml if needed and return $config array

 * INPUTS

 *   $parse       - boolean to force parse_config() to read config.xml and generate config.cache

 * RESULT

 *   $config      - array containing all configuration variables

 ******/

function parse_config($parse = false) {

	global $g, $config_parsed;

	$lockkey = lock('config');

	$config_parsed == false;

	if (!file_exists("{$g['conf_path']}/config.xml") || filesize("{$g['conf_path']}/config.xml") == 0) {

		$last_backup = discover_last_backup();

		if($last_backup) {

			log_error("No config.xml found, attempting last known config restore.");

			file_notice("config.xml", "No config.xml found, attempting last known config restore.", "pfSenseConfigurator", "");

			restore_backup("{$g['conf_path']}/backup/{$last_backup}");

		} else {

			unlock($lockkey);

			die("Config.xml is corrupted and is 0 bytes.  Could not restore a previous backup.");

		}

	}

	if($g['booting']) echo ".";

	// Check for encrypted config.xml

	encrypted_configxml();

	if(!$parse) {

		if(file_exists($g['tmp_path'] . '/config.cache')) {

			$config = unserialize(file_get_contents($g['tmp_path'] . '/config.cache'));

			if(is_null($config)) {

				unlock($lockkey);

				parse_config(true);

				$lockkey = lock('config');

			}

		} else {

			if(!file_exists($g['conf_path'] . "/config.xml")) {

				log_error("No config.xml found, attempting last known config restore.");

				file_notice("config.xml", "No config.xml found, attempting last known config restore.", "pfSenseConfigurator", "");

				$last_backup = discover_last_backup();

				if ($last_backup)

					restore_backup("/cf/conf/backup/{$last_backup}");

				else

					log_error("Could not restore config.xml.");

			}

			unlock($lockkey);

			$config = parse_config(true);

			$lockkey = lock('config');

		}

	} else {

		if(!file_exists($g['conf_path'] . "/config.xml")) {

			if($g['booting']) echo ".";

			log_error("No config.xml found, attempting last known config restore.");

			file_notice("config.xml", "No config.xml found, attempting last known config restore.", "pfSenseConfigurator", "");

			$last_backup = discover_last_backup();

			if ($last_backup)

				restore_backup("/cf/conf/backup/{$last_backup}");

			else

				log_error("Could not restore config.xml.");

		}

		$config = parse_xml_config($g['conf_path'] . '/config.xml', $g['xml_rootobj']);

		if($config == "-1") {

			$last_backup = discover_last_backup();

			if ($last_backup)

				restore_backup("/cf/conf/backup/{$last_backup}");

			else

				log_error(gettext("Could not restore config.xml."));

		}

		generate_config_cache($config);

	}

	if($g['booting']) echo ".";

	alias_make_table($config);

	$config_parsed = true;

	unlock($lockkey);

	return $config;

}

/****f* config/generate_config_cache

 * NAME

 *   generate_config_cache - Write serialized configuration to cache.

 * INPUTS

 *   $config	- array containing current firewall configuration

 * RESULT

 *   boolean	- true on completion

 ******/

function generate_config_cache($config) {

	global $g;

	$configcache = fopen($g['tmp_path'] . '/config.cache', "w");

	fwrite($configcache, serialize($config));

	fclose($configcache);

}

function discover_last_backup() {

        $backups = split("\n", `cd /cf/conf/backup && ls -ltr *.xml | awk '{print \$9}'`);

	$last_backup = "";

        foreach($backups as $backup)

        	if($backup)

	        	$last_backup = $backup;

        return $last_backup;

}

function restore_backup($file) {

	global $g;

	if (file_exists($file)) {

		conf_mount_rw();

		copy("$file","/cf/conf/config.xml");

		unlink_if_exists("{$g['tmp_path']}/config.cache");

		log_error("{$g['product_name']} is restoring the configuration $file");

		file_notice("config.xml", "{$g['product_name']} is restoring the configuration $file", "pfSenseConfigurator", "");

		conf_mount_ro();

	}

}

/****f* config/parse_config_bootup

 * NAME

 *   parse_config_bootup - Bootup-specific configuration checks.

 * RESULT

 *   null

 ******/

function parse_config_bootup() {

	global $config, $g, $noparseconfig;

	if($g['booting']) echo ".";

	$lockkey = lock('config');

	if (!$noparseconfig) {

		if (!file_exists("{$g['conf_path']}/config.xml")) {

			if ($g['booting']) {

				if (strstr($g['platform'], "cdrom")) {

					/* try copying the default config. to the floppy */

					echo "Resetting factory defaults...\n";

					reset_factory_defaults(true);

					if (file_exists("{$g['conf_path']}/config.xml")) {

						/* do nothing, we have a file. */

					} else {

						echo "No XML configuration file found - using factory defaults.\n";

						echo "Make sure that the configuration floppy disk with the conf/config.xml\n";

						echo "file is inserted. If it isn't, your configuration changes will be lost\n";

						echo "on reboot.\n";

					}

				} else {

					$last_backup = discover_last_backup();

					if($last_backup) {

						log_error("No config.xml found, attempting last known config restore.");

						file_notice("config.xml", "No config.xml found, attempting last known config restore.", "pfSenseConfigurator", "");

						restore_backup("/cf/conf/backup/{$last_backup}");

					}

					if(!file_exists("{$g['conf_path']}/config.xml")) {

						echo "XML configuration file not found.  {$g['product_name']} cannot continue booting.\n";

						mwexec("/sbin/halt");

						exit;

					}

					log_error("Last known config found and restored.  Please double check your configuration file for accuracy.");

					file_notice("config.xml", "Last known config found and restored.  Please double check your configuration file for accuracy.", "pfSenseConfigurator", "");

				}

			} else {

				unlock($lockkey);

				exit(0);

			}

		}

	}

	if (filesize("{$g['conf_path']}/config.xml") == 0) {

		$last_backup = discover_last_backup();

		if($last_backup) {

			log_error("No config.xml found, attempting last known config restore.");

			file_notice("config.xml", "No config.xml found, attempting last known config restore.", "pfSenseConfigurator", "");

			restore_backup("{$g['conf_path']}/backup/{$last_backup}");

		} else {

			unlock($lockkey);

			die("Config.xml is corrupted and is 0 bytes.  Could not restore a previous backup.");

		}

	}

	unlock($lockkey);

	parse_config(true);

	if ((float)$config['version'] > (float)$g['latest_config']) {

		echo <<<EOD

*******************************************************************************

* WARNING!                                                                    *

* The current configuration has been created with a newer version of {$g['product_name']}  *

* than this one! This can lead to serious misbehavior and even security       *

* holes! You are urged to either upgrade to a newer version of {$g['product_name']} or     *

* revert to the default configuration immediately!                            *

*******************************************************************************

EOD;

		}

	/* make alias table (for faster lookups) */

	alias_make_table($config);

}

/****f* config/conf_mount_rw

 * NAME

 *   conf_mount_rw - Mount filesystems read/write.

 * RESULT

 *   null

 ******/

/* mount flash card read/write */

function conf_mount_rw() {

	global $g;

	/* do not mount on cdrom platform */

	if($g['platform'] == "cdrom" or $g['platform'] == "pfSense")

		return;

	if (is_subsystem_dirty('mount'))

		return;

	$status = mwexec("/sbin/mount -u -w {$g['cf_path']}");

	if($status <> 0) {

		if($g['booting'])

			echo "Disk is dirty.  Running fsck -y\n";

		mwexec("/sbin/fsck -y {$g['cf_path']}");

		$status = mwexec("/sbin/mount -u -w {$g['cf_path']}");

	}

	/*    if the platform is soekris or wrap or pfSense, lets mount the

	 *    compact flash cards root.

         */

	if($g['platform'] == "wrap" or $g['platform'] == "net45xx"

	   or $g['platform'] == "embedded" or $g['platform'] == "nanobsd") {

		$status = mwexec("/sbin/mount -u -w /");

		/* we could not mount this correctly.  kick off fsck */

		if($status <> 0) {

			log_error("File system is dirty.  Launching FSCK for /");

			mwexec("/sbin/fsck -y /");

			$status = mwexec("/sbin/mount -u -w /");

		}

	}

	mark_subsystem_dirty('mount');

}

/****f* config/conf_mount_ro

 * NAME

 *   conf_mount_ro - Mount filesystems readonly.

 * RESULT

 *   null

 ******/

function conf_mount_ro() {

	global $g;

	if($g['booting'] == true)

		return;

	/* firmare upgrade in progress */

	if (is_subsystem_dirty('firmwarelock'))

		return;

	/* do not umount if generating ssh keys */

	if (is_subsystem_dirty('sshdkeys'))

		return;

	/* do not umount on cdrom or pfSense platforms */

	if($g['platform'] == "cdrom" or $g['platform'] == "pfSense")

		return;

	if (!is_subsystem_dirty('mount'))

		return;

	clear_subsystem_dirty('mount');

	/* sync data, then force a remount of /cf */

	mwexec("/bin/sync");

	mwexec("/bin/sync");

	mwexec("/sbin/mount -u -r -f {$g['cf_path']}");

	mwexec("/sbin/mount -u -r -f /");

}

/****f* config/convert_config

 * NAME

 *   convert_config - Attempt to update config.xml.

 * DESCRIPTION

 *   convert_config() reads the current global configuration

 *   and attempts to convert it to conform to the latest

 *   config.xml version. This allows major formatting changes

 *   to be made with a minimum of breakage.

 * RESULT

 *   null

 ******/

/* convert configuration, if necessary */

function convert_config() {

	global $config, $g;

	$now = date("H:i:s");

	log_error("Start Configuration upgrade at $now, set execution timeout to 15 minutes");

	ini_set("max_execution_time", "900");

	/* special case upgrades */

	/* fix every minute crontab bogons entry */

	$cron_item_count = count($config['cron']['item']);

	for($x=0; $x<$cron_item_count; $x++) {

		if(stristr($config['cron']['item'][$x]['command'], "rc.update_bogons.sh")) {

			if($config['cron']['item'][$x]['hour'] == "*" ) {

		        $config['cron']['item'][$x]['hour'] = "3";

		 		write_config("Updated bogon update frequency to 3am");

		 		log_error("Updated bogon update frequency to 3am");

		 	}       

		}

	}

	if ($config['version'] == $g['latest_config'])

		return;		/* already at latest version */

	// Save off config version

	$prev_version = $config['version'];

	include_once('upgrade_config.inc');

	/* Loop and run upgrade_VER_to_VER() until we're at current version */

	while ($config['version'] < $g['latest_config']) {

		$cur = $config['version'] * 10;

		$next = $cur + 1;

		$migration_function = sprintf('upgrade_%03d_to_%03d', $cur, $next);

		$migration_function();

		$config['version'] = sprintf('%.1f', $next / 10);

		echo ".";

	}

	$now = date("H:i:s");

	log_error("Ended Configuration upgrade at $now");

	if ($prev_version != $config['version'])

		write_config("Upgraded config version level from {$prev_version} to {$config['version']}");

}

/****f* config/write_config

 * NAME

 *   write_config - Backup and write the firewall configuration.

 * DESCRIPTION

 *   write_config() handles backing up the current configuration,

 *   applying changes, and regenerating the configuration cache.

 * INPUTS

 *   $desc	- string containing the a description of configuration changes

 *   $backup	- boolean: do not back up current configuration if false.

 * RESULT

 *   null

 ******/

/* save the system configuration */

function write_config($desc="Unknown", $backup = true) {

	global $config, $g;

	if($g['bootup']) 

		log_error("WARNING! Configuration written on bootup.  This can cause stray openvpn and load balancing items in config.xml");

	if($backup)

		backup_config();

	if (time() > mktime(0, 0, 0, 9, 1, 2004))       /* make sure the clock settings are plausible */

		$changetime = time();

	/* Log the running script so it's not entirely unlogged what changed */

    if ($desc == "Unknown")

		$desc = "{$_SERVER['SCRIPT_NAME']} made unknown change";

	$config['revision']['description'] = $desc;

	$config['revision']['time'] = $changetime;

	$lockkey = lock('config');

	/* generate configuration XML */

	$xmlconfig = dump_xml_config($config, $g['xml_rootobj']);

	conf_mount_rw();

	/* write new configuration */

	$fd = fopen("{$g['cf_conf_path']}/config.xml", "w");

        if (!$fd) {

                // Unable to open temporary file for writing

		log_error("WARNING: Config contents could not be save. Could not open file!");

		unlock($lockkey);

                return false;

        }

        if (!fwrite($fd, $xmlconfig)) {

                // Unable to write to temporary file

		log_error("WARNING: Config contents could not be written on file.");

                fclose($fd);

		unlock($lockkey);

                return false;

        }

        fclose($fd);

	if($g['platform'] == "embedded" or $g['platform'] == "nanobsd") {

		cleanup_backupcache(5, true);

	} else {

		cleanup_backupcache(30, true);

	}

	/* re-read configuration */

	$config = parse_xml_config("{$g['conf_path']}/config.xml", $g['xml_rootobj']);

	/* write config cache */

	$fd = @fopen("{$g['tmp_path']}/config.cache", "wb");

	if ($fd) {

		fwrite($fd, serialize($config));

		fclose($fd);

	}

	/* tell kernel to sync fs data */

	if (!$g['booting'])

		conf_mount_ro();

	unlock($lockkey);

	unlink_if_exists("/usr/local/pkg/pf/carp_sync_client.php");

	/* sync carp entries to other firewalls */

        carp_sync_client();

	if(is_dir("/usr/local/pkg/write_config")) {

		/* process packager manager custom rules */

		run_plugins("/usr/local/pkg/write_config/");

	}

	return $config;

}

/****f* config/reset_factory_defaults

 * NAME

 *   reset_factory_defaults - Reset the system to its default configuration.

 * RESULT

 *   integer	- indicates completion

 ******/

function reset_factory_defaults($lock = false) {

	global $g;

	if (!$lock)

		$lockkey = lock('config');

	conf_mount_rw();

	/* create conf directory, if necessary */

	safe_mkdir("{$g['cf_conf_path']}");

	/* clear out /conf */

	$dh = opendir($g['conf_path']);

	while ($filename = readdir($dh)) {

		if (($filename != ".") && ($filename != "..")) {

			unlink_if_exists($g['conf_path'] . "/" . $filename);

		}

	}

	closedir($dh);

	/* copy default configuration */

	copy("{$g['conf_default_path']}/config.xml", "{$g['conf_path']}/config.xml");

	/* call the wizard */

	touch("/conf/trigger_initial_wizard");

	conf_mount_ro();

	if (!$lock)

		unlock($lockkey);

	return 0;

}

function config_restore($conffile) {

	global $config, $g;

	if (!file_exists($conffile))

		return 1;

	conf_mount_rw();

	backup_config();

	$lockkey = lock('config');

	copy($conffile, "{$g['cf_conf_path']}/config.xml");

	unlink_if_exists("{$g['tmp_path']}/config.cache");

	unlock($lockkey);

	$config = parse_config(true);

	write_config("Reverted to " . array_pop(explode("/", $conffile)) . ".", false);

	conf_mount_ro();

	return 0;

}

function config_install($conffile) {

	global $config, $g;

	if (!file_exists($conffile))

		return 1;

	if (!config_validate("{$conffile}"))

		return 1;

	if($g['booting'] == true)

		echo "Installing configuration...\n";

	else

		log_error("Installing configuration ....");

	conf_mount_rw();

	$lockkey = lock('config');

	copy($conffile, "{$g['conf_path']}/config.xml");

	/* unlink cache file if it exists */

	if(file_exists("{$g['tmp_path']}/config.cache"))

		unlink("{$g['tmp_path']}/config.cache");

	unlock($lockkey);

	conf_mount_ro();

    return 0;

}

function config_validate($conffile) {

	global $g, $xmlerr;

	$xml_parser = xml_parser_create();

	if (!($fp = fopen($conffile, "r"))) {

		$xmlerr = "XML error: unable to open file";

		return false;

	}

	while ($data = fread($fp, 4096)) {

		if (!xml_parse($xml_parser, $data, feof($fp))) {

			$xmlerr = sprintf("%s at line %d",

						xml_error_string(xml_get_error_code($xml_parser)),

						xml_get_current_line_number($xml_parser));

			return false;

		}

	}

	xml_parser_free($xml_parser);

	fclose($fp);

	return true;

}

function set_networking_interfaces_ports() {

	global $noreboot;

	global $config;

	global $g;

	global $fp;

	$fp = fopen('php://stdin', 'r');

	$memory = get_memory();

	$avail = $memory[0];

	if($avail < $g['minimum_ram_warning']) {

		echo "\n\n\n";

		echo "DANGER!  WARNING!  ACHTUNG!\n\n";

		echo "{$g['product_name']} requires *AT LEAST* {$g['minimum_ram_warning_text']} RAM to function correctly.\n";

		echo "Only ({$avail}) MB RAM has been detected.\n";

		echo "\nPress ENTER to continue. ";

		fgets($fp);

		echo "\n";

	}

	$iflist = get_interface_list();

/* Function flow is based on $key and $auto_assign or the lack thereof */	

	$key = null;

/* Only present auto interface option if running from LiveCD and interface mismatch*/

	if ((ereg("cdrom", $g['platform'])) && is_interface_mismatch())

		$auto_assign = false;

	echo <<<EOD

Valid interfaces are:

EOD;

	if(!is_array($iflist)) {

		echo "No interfaces found!\n";

		$iflist = array();

	} else {

		foreach ($iflist as $iface => $ifa) {

			echo sprintf("% -16s%s%s\t%s\n", $iface, $ifa['mac'],

				$ifa['up'] ? "   (up)" : "   (down)", $ifa['dmesg']);

		}

	}

	if ($auto_assign) {

		echo <<<EOD

		!!! LiveCD Detected: Auto Interface Option !!!!

BEGIN MANUAL CONFIGURATION OR WE WILL PROCEED WITH AUTO CONFIGURATION.

EOD;

	}	

	echo <<<EOD

Do you want to set up VLANs first? 

If you are not going to use VLANs, or only for optional interfaces, you should

say no here and use the webConfigurator to configure VLANs later, if required.

Do you want to set up VLANs now [y|n]? 

EOD;

	if ($auto_assign) {

		$key = timeout();

	} else

		$key = chop(fgets($fp));

	if (!isset($key) and $auto_assign) {	// Auto Assign Interfaces

		do {

			echo <<<EOD

   !!! Auto Assigning Interfaces !!!

For installation purposes, you must plug in at least one NIC

for the LAN connection. If you plug in a second NIC it will be

assigned to WAN. Otherwise, we'll temporarily assign WAN to the

next available NIC found regardless of activity. You should

assign and configure the WAN interface according to your requirements

If you haven't plugged in any network cables yet,

now is the time to do so.

We'll keep trying until you do.

Searching for active interfaces...

EOD;

			unset($wanif, $lanif);

			$media_iflist = $plugged_in = array();

			$media_iflist = get_interface_list("media");

			foreach ($media_iflist as $iface => $ifa) {

				if ($ifa['up']) 

					$plugged_in[] = $iface;

			}

			$lanif = array_shift($plugged_in);

			$wanif = array_shift($plugged_in);

			if(isset($lanif) && !isset($wanif)) {

				foreach ($iflist as $iface => $ifa) {

					if ($iface != $lanif) {

						$wanif = $iface;

						break;

					}

				}

			}

			echo <<<EOD

Assigned WAN to : $wanif 

Assigned LAN to : $lanif

If you don't like this assignment,

press any key to go back to manual configuration. 

EOD;

			$key = timeout(20);

			if(isset($key))

				return;

		} while (!isset($wanif));

		$config['system']['enablesshd'] = 'enabled';	

		$key = 'y';

	} else {		//Manually assign interfaces	

		if (in_array($key, array('y', 'Y')))

			vlan_setup();

		if (is_array($config['vlans']['vlan']) && count($config['vlans']['vlan'])) {

			echo "\n\nVLAN interfaces:\n\n";

			foreach ($config['vlans']['vlan'] as $vlan) {

				echo sprintf("% -16s%s\n", "{$vlan['if']}_vlan{$vlan['tag']}",

					"VLAN tag {$vlan['tag']}, parent interface {$vlan['if']}");

				$iflist[$vlan['if'] . '_vlan' . $vlan['tag']] = array();

			}

		}

		echo <<<EOD

*NOTE*  {$g['product_name']} requires {$g['minimum_nic_count_text']} assigned interfaces to function.

        If you do not have {$g['minimum_nic_count_text']} interfaces you CANNOT continue. 

        If you do not have at least {$g['minimum_nic_count']} *REAL* network interface cards

        or one interface with multiple VLANs then {$g['product_name']}

        *WILL NOT* function correctly.

If you do not know the names of your interfaces, you may choose to use

auto-detection. In that case, disconnect all interfaces now before

hitting 'a' to initiate auto detection.

EOD;

		do {

			echo "\nEnter the WAN interface name or 'a' for auto-detection: ";

			$wanif = chop(fgets($fp));

			if ($wanif === "") {

				return;

			}

			if ($wanif === "a")

				$wanif = autodetect_interface("WAN", $fp);

			else if (!array_key_exists($wanif, $iflist)) {

				echo "\nInvalid interface name '{$wanif}'\n";

				unset($wanif);

				continue;

			}

		} while (!$wanif);

		do {

			echo "\nEnter the LAN interface name or 'a' for auto-detection \n" .

			    "NOTE: this enables full Firewalling/NAT mode.\n" .

				"(or nothing if finished): ";

			$lanif = chop(fgets($fp));

			if($lanif == "exit") {

				exit;

			}

			if($lanif == "") {

				if($g['minimum_nic_count'] < 2) {

					break;	

				} else {

					fclose($fp);

					return;

				}

			}

			if ($lanif === "a")

				$lanif = autodetect_interface("LAN", $fp);

			else if (!array_key_exists($lanif, $iflist)) {

				echo "\nInvalid interface name '{$lanif}'\n";

				unset($lanif);

				continue;

			}

		} while (!$lanif);

		/* optional interfaces */

		$i = 0;

		$optif = array();

		if($lanif <> "") {

			while (1) {

				if ($optif[$i])

					$i++;

				$i1 = $i + 1;

				if($config['interfaces']['opt' . $i1]['descr'])

					echo "\nOptional interface {$i1} description found: {$config['interfaces']['opt' . $i1]['descr']}";

				echo "\nEnter the Optional {$i1} interface name or 'a' for auto-detection\n" .

					"(or nothing if finished): ";

				$optif[$i] = chop(fgets($fp));

				if ($optif[$i]) {

					if ($optif[$i] === "a") {

						$ad = autodetect_interface("Optional " . $i1, $fp);

						if ($ad)

							$optif[$i] = $ad;

						else

							unset($optif[$i]);

					} else if (!array_key_exists($optif[$i], $iflist)) {

						echo "\nInvalid interface name '{$optif[$i]}'\n";

						unset($optif[$i]);

						continue;

					}

				} else {

					unset($optif[$i]);

					break;

				}

			}

		}

		/* check for double assignments */

		$ifarr = array_merge(array($lanif, $wanif), $optif);

		for ($i = 0; $i < (count($ifarr)-1); $i++) {

			for ($j = ($i+1); $j < count($ifarr); $j++) {

				if ($ifarr[$i] == $ifarr[$j]) {

					echo <<<EOD

Error: you cannot assign the same interface name twice!

EOD;

					fclose($fp);

					return;

				}

			}

		}

		echo "\nThe interfaces will be assigned as follows: \n\n";

		if ($lanif != "")

			echo "LAN  ->" . $lanif . "\n";

		echo "WAN  ->" . $wanif . "\n";

		for ($i = 0; $i < count($optif); $i++) {

			echo "OPT" . ($i+1) . " -> " . $optif[$i] . "\n";

		}

		echo <<<EOD