UnivNautes

<?php

/*  

	external config loader

	Copyright (C) 2010 Scott Ullrich

        Copyright (C) 2013-2014 Electric Sheep Fencing, LP

	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.

	Currently supported file system types: MS-Dos, FreeBSD UFS

*/

require_once("globals.inc");

require_once("functions.inc");

require_once("config.lib.inc");

require_once("config.inc");

$debug = false;

function get_boot_disk() {

	global $g, $debug;

	$disk = exec("/sbin/mount | /usr/bin/grep \"on / \" | /usr/bin/cut -d'/' -f3 | /usr/bin/cut -d' ' -f1");

	return $disk;

}

function get_swap_disks() {

	exec("/usr/sbin/swapinfo | /usr/bin/sed '/^\/dev/!d; s,^/dev/,,; s, .*\$,,'", $disks);

	return $disks;

}

function get_disk_slices($disk) {

	global $g, $debug;

	$slices_array = array();

	$slices = trim(exec("/bin/ls " . escapeshellarg("/dev/" . $disk . "s*") . " 2>/dev/null"));

	$slices = str_replace("/dev/", "", $slices);

	if($slices == "ls: No match.") 

		return;

	$slices_array = explode(" ", $slices);

	return $slices_array;

}

function get_disks() {

	global $g, $debug;

	$disks_array = array();

	$disks_s = explode(" ", get_single_sysctl("kern.disks"));

	foreach($disks_s as $disk)

		if(trim($disk))

			$disks_array[] = $disk;

	return $disks_array;

}

function discover_config($mountpoint) {

	global $g, $debug;

	$locations_to_check = array("/", "/config");

	foreach($locations_to_check as $ltc) {

		$tocheck = "/tmp/mnt/cf{$ltc}config.xml";

		if($debug) {

			echo "\nChecking for $tocheck";

			if(file_exists($tocheck)) 

				echo " -> found!";

		}

		if(file_exists($tocheck)) 

			return $tocheck;

	}

	return "";

}

function test_config($file_location) {

	global $g, $debug;

	if(!$file_location) 

		return;

	// config.xml was found.  ensure it is sound.

	$root_obj = trim("<{$g['xml_rootobj']}>");

	$xml_file_head = exec("/usr/bin/head -2 " . escapeshellarg($file_location) . " | /usr/bin/tail -n1");

	if($debug) {

		echo "\nroot obj  = $root_obj";

		echo "\nfile head = $xml_file_head";

	}

	if($xml_file_head == $root_obj) {

		// Now parse config to make sure

		$config_status = config_validate($file_location);

		if($config_status) 	

			return true;

	}

	return false;

}

// Probes all disks looking for config.xml

function find_config_xml() {

	global $g, $debug;

	$disks = get_disks();

	// Safety check.

	if(!is_array($disks)) 

		return;

	$boot_disk = get_boot_disk();

	$swap_disks = get_swap_disks();

	exec("/bin/mkdir -p /tmp/mnt/cf");

	foreach($disks as $disk) {

		$slices = get_disk_slices($disk);

		if(is_array($slices)) {

			foreach($slices as $slice) {

				if($slice == "")

					continue;

				if(stristr($slice, $boot_disk)) {

					if($debug) 

						echo "\nSkipping boot device slice $slice";

					continue;

				}

				if(in_array($slice, $swap_disks)) {

					if($debug)

						echo "\nSkipping swap device slice $slice";

					continue;

				}

				echo " $slice";

				// First try msdos fs

				if($debug) 

					echo "\n/sbin/mount -t msdosfs /dev/{$slice} /tmp/mnt/cf 2>/dev/null \n";

				$result = exec("/sbin/mount -t msdosfs /dev/{$slice} /tmp/mnt/cf 2>/dev/null");

				// Next try regular fs (ufs)

				if(!$result) {

					if($debug) 

						echo "\n/sbin/mount /dev/{$slice} /tmp/mnt/cf 2>/dev/null \n";

					$result = exec("/sbin/mount /dev/{$slice} /tmp/mnt/cf 2>/dev/null");

				}

				$mounted = trim(exec("/sbin/mount | /usr/bin/grep -v grep | /usr/bin/grep '/tmp/mnt/cf' | /usr/bin/wc -l"));

				if($debug) 

					echo "\nmounted: $mounted ";

				if(intval($mounted) > 0) {

					// Item was mounted - look for config.xml file

					$config_location = discover_config($slice);

					if($config_location) {

						if(test_config($config_location)) {

							// We have a valid configuration.  Install it.

							echo " -> found config.xml\n";

							echo "Backing up old configuration...\n";

							backup_config();

							echo "Restoring [{$slice}] {$config_location}...\n";

							restore_backup($config_location);

							echo "Cleaning up...\n";

							exec("/sbin/umount /tmp/mnt/cf");

							exit;

						}

					}

					exec("/sbin/umount /tmp/mnt/cf");

				}

			}

		}

	}

}

echo "External config loader 1.0 is now starting...";

find_config_xml();

echo "\n";

?>