pfSense

<?php

/* $Id$ */

/*

	util.inc

	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.

*/

/* kill a process by pid file */

function killbypid($pidfile) {

	sigkillbypid($pidfile, "TERM");

}

/* sigkill a process by pid file */

function sigkillbypid($pidfile, $sig) {

	if (file_exists($pidfile)) {

		mwexec("/bin/kill -s $sig `/bin/cat " . $pidfile . "`");

	}

}

/* kill a process by name */

function killbyname($procname) {

	mwexec("/usr/bin/killall " . escapeshellarg($procname));

}

/* return the subnet address given a host address and a subnet bit count */

function gen_subnet($ipaddr, $bits) {

	if (!is_ipaddr($ipaddr) || !is_numeric($bits))

		return "";

	return long2ip(ip2long($ipaddr) & gen_subnet_mask_long($bits));

}

/* return the highest (broadcast) address in the subnet given a host address and a subnet bit count */

function gen_subnet_max($ipaddr, $bits) {

	if (!is_ipaddr($ipaddr) || !is_numeric($bits))

		return "";

	return long2ip(ip2long($ipaddr) | ~gen_subnet_mask_long($bits));

}

/* returns a subnet mask (long given a bit count) */

function gen_subnet_mask_long($bits) {

	$sm = 0;

	for ($i = 0; $i < $bits; $i++) {

		$sm >>= 1;

		$sm |= 0x80000000;

	}

	return $sm;

}

/* same as above but returns a string */

function gen_subnet_mask($bits) {

	return long2ip(gen_subnet_mask_long($bits));

}

function is_numericint($arg) {

	return (preg_match("/[^0-9]/", $arg) ? false : true);

}

/* returns true if $ipaddr is a valid dotted IPv4 address */

function is_ipaddr($ipaddr) {

	if (!is_string($ipaddr))

		return false;

	$ip_long = ip2long($ipaddr);

	$ip_reverse = long2ip($ip_long);

	if ($ipaddr == $ip_reverse)

		return true;

	else

		return false;

}

/* returns true if $ipaddr is a valid dotted IPv4 address or an alias thereof */

function is_ipaddroralias($ipaddr) {

	global $aliastable, $config;

	if(is_array($config['aliases']['alias'])) {

		foreach($config['aliases']['alias'] as $alias) {

			if($alias['name'] == $ipaddr)

				return true;

		}

	}

	if (isset($aliastable[$ipaddr]) && is_ipaddr($aliastable[$ipaddr]))

		return true;

	else

		return is_ipaddr($ipaddr);

}

/* returns true if $ipaddr is a valid dotted IPv4 address or any alias */

function is_ipaddroranyalias($ipaddr) {

	global $aliastable;

	if (isset($aliastable[$ipaddr]))

		return true;

	else

		return is_ipaddr($ipaddr);

}

/* returns true if $subnet is a valid subnet in CIDR format */

function is_subnet($subnet) {

	if (!is_string($subnet))

		return false;

	list($hp,$np) = explode('/', $subnet);

	if (!is_ipaddr($hp))

		return false;

	if (!is_numeric($np) || ($np < 1) || ($np > 32))

		return false;

	return true;

}

/* returns true if $subnet is a valid subnet in CIDR format or an alias thereof */

function is_subnetoralias($subnet) {

	global $aliastable;

	if (isset($aliastable[$subnet]) && is_subnet($aliastable[$subnet]))

		return true;

	else

		return is_subnet($subnet);

}

/* returns true if $hostname is a valid hostname */

function is_hostname($hostname) {

	if (!is_string($hostname))

		return false;

	if (preg_match("/^[a-z0-9\-]+$/i", $hostname))

		return true;

	else

		return false;

}

/* returns true if $domain is a valid domain name */

function is_domain($domain) {

	if (!is_string($domain))

		return false;

	if (preg_match("/^([a-z0-9\-]+\.?)*$/i", $domain))

		return true;

	else

		return false;

}

/* returns true if $uname is a valid DynDNS username */

function is_dyndns_username($uname) {

	if (!is_string($uname))

		return false;

	if (preg_match("/[^a-z0-9\-.@_]/i", $uname))

		return false;

	else

		return true;

}

/* returns true if $macaddr is a valid MAC address */

function is_macaddr($macaddr) {

	if (!is_string($macaddr))

		return false;

	$maca = explode(":", $macaddr);

	if (count($maca) != 6)

		return false;

	foreach ($maca as $macel) {

		if (($macel === "") || (strlen($macel) > 2))

			return false;

		if (preg_match("/[^0-9a-f]/i", $macel))

			return false;

	}

	return true;

}

/* returns true if $name is a valid name for an alias */

/* returns NULL if a reserved word is used */

function is_validaliasname($name) {

	/* Array of reserved words */

	$reserved = array("port", "pass");

	if (in_array($name, $reserved, true))

		return; /* return NULL */

	if (!preg_match("/[^a-zA-Z0-9]/", $name))

		return true;

	else

		return false;

}

/* returns true if $port is a valid TCP/UDP port */

function is_port($port) {

	if (!is_numericint($port))

		return false;

	if (($port < 1) || ($port > 65535))

		return false;

	else

		return true;

}

/*

 *   get_interface_list() - Return a list of all physical interfaces

 *   along with MAC and status.

 *

 *   $mode = "active" - use ifconfig -lu

 *           "media"  - use ifconfig to check physical connection

 *			status (much slower)

 */

function get_interface_list($mode = "active", $keyby = "physical") {

        global $config;

	$upints = array();

        /* get a list of virtual interface types */

        $vfaces = explode(" ", trim(shell_exec("/sbin/ifconfig -C")));

	switch($mode) {

	case "active":

                $upints = explode(" ", trim(shell_exec("/sbin/ifconfig -lu")));

        	break;

	case "media":

                $intlist = explode(" ", trim(shell_exec("/sbin/ifconfig -l")));

                exec("/sbin/ifconfig -a", $ifconfig);

                $regexp = '/(' . implode('|', $intlist) . '):\s/';

                $ifstatus = preg_grep('/status:/', $ifconfig);

		foreach($ifstatus as $status) {

			$int = array_shift($intlist);

                	if(stristr($status, "active")) $upints[] = $int;

		}

		break;

	}

        /* build interface list with netstat */

        exec("/usr/bin/netstat -inW -f link | awk '{ print $1, $4 } '", $linkinfo);

        array_shift($linkinfo);

        foreach ($linkinfo as $link) {

                $alink = explode(" ", $link);

                $ifname = rtrim(trim($alink[0]), '*');

                if (!in_array(substr($ifname, 0, -1), $vfaces)) {

			$toput = array(

					"mac" => trim($alink[1]),

					"up" => in_array($ifname, $upints)

				);

			foreach($config['interfaces'] as $name => $int) {

				if($int['if'] == $ifname) $friendly = $name;

			}

			switch($keyby) {

			case "physical":

				$toput['friendly'] = $friendly;

				$iflist[$ifname] = $toput;

				break;

			case "friendly":

				$toput['if'] = $ifname;

				$iflist[$friendly] = $toput;

				break;

			}

                }

        }

        return $iflist;

}

/* wrapper for exec() */

function mwexec($command) {

	global $g;

	if ($g['debug']) {

		if (!$_SERVER['REMOTE_ADDR'])

			echo "mwexec(): $command\n";

		passthru($command, $retval);

	} else {

		exec("$command > /dev/null 2>&1", $oarr, $retval);

	}

	return $retval;

}

/* wrapper for exec() in background */

function mwexec_bg($command) {

	global $g;

	if ($g['debug']) {

		if (!$_SERVER['REMOTE_ADDR'])

			echo "mwexec(): $command\n";

	}

	exec("nohup $command > /dev/null 2>&1 &");

}

/* unlink a file, if it exists */

function unlink_if_exists($fn) {

	$to_do = glob($fn);

	if(is_array($to_do)) {

		foreach($to_do as $filename)

			@unlink($filename);

	} else {

		@unlink($fn);

	}

}

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

function alias_make_table($config) {

	global $aliastable;

	$aliastable = array();

	if (is_array($config['aliases']['alias'])) {

		foreach ($config['aliases']['alias'] as $alias) {

			if ($alias['name'])

				$aliastable[$alias['name']] = $alias['address'];

		}

	}

}

/* check if an alias exists */

function is_alias($name) {

	global $aliastable;

	return isset($aliastable[$name]);

}	

function alias_expand_value($name) {

	global $aliastable, $config;

	foreach($config['aliases']['alias'] as $alias) {

		if($alias['name'] == $name)

			return $alias['address'];

	}

}

/* expand a host or network alias, if necessary */

function alias_expand($name) {

	global $aliastable;

	if (isset($aliastable[$name]))

		return "\${$name}";

	else if (is_ipaddr($name) || is_subnet($name))

		return "{$name}";

	else

		return null;

}

/* expand a host alias, if necessary */

function alias_expand_host($name) {

	global $aliastable;

	if (isset($aliastable[$name]) && is_ipaddr($aliastable[$name]))

		return $aliastable[$name];

	else if (is_ipaddr($name))

		return $name;

	else

		return null;

}

/* expand a network alias, if necessary */

function alias_expand_net($name) {

	global $aliastable;

	if (isset($aliastable[$name]) && is_subnet($aliastable[$name]))

		return $aliastable[$name];

	else if (is_subnet($name))

		return $name;

	else

		return null;

}

/* find out whether two subnets overlap */

function check_subnets_overlap($subnet1, $bits1, $subnet2, $bits2) {

	if (!is_numeric($bits1))

		$bits1 = 32;

	if (!is_numeric($bits2))

		$bits2 = 32;

	if ($bits1 < $bits2)

		$relbits = $bits1;

	else

		$relbits = $bits2;

	$sn1 = gen_subnet_mask_long($relbits) & ip2long($subnet1);

	$sn2 = gen_subnet_mask_long($relbits) & ip2long($subnet2);

	if ($sn1 == $sn2)

		return true;

	else

		return false;

}

/* compare two IP addresses */

function ipcmp($a, $b) {

	if (ip2long($a) < ip2long($b))

		return -1;

	else if (ip2long($a) > ip2long($b))

		return 1;

	else

		return 0;

}

/* return true if $addr is in $subnet, false if not */

function ip_in_subnet($addr,$subnet) {

	list($ip, $mask) = explode('/', $subnet);

	$mask = 0xffffffff << (32 - $mask);

	return ((ip2long($addr) & $mask) == (ip2long($ip) & $mask));

}

/* verify (and remove) the digital signature on a file - returns 0 if OK */

function verify_digital_signature($fname) {

	global $g;

	return mwexec("/usr/local/bin/verifysig " .

		escapeshellarg("{$g['etc_path']}/pubkey.pem") . " " .

		escapeshellarg($fname));

}

/* obtain MAC address given an IP address by looking at the ARP table */

function arp_get_mac_by_ip($ip) {

	mwexec("/sbin/ping -c 1 -t 1 {$ip}");

	exec("/usr/sbin/arp -n {$ip}", $arpoutput);

	if ($arpoutput[0]) {

		$arpi = explode(" ", $arpoutput[0]);

		$macaddr = $arpi[3];

		if (is_macaddr($macaddr))

			return $macaddr;

		else

			return false;

	}

	return false;

}

/* return a fieldname that is safe for xml usage */

function xml_safe_fieldname($fieldname) {

	$replace = array('/', '-', ' ', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',

			 '_', '+', '=', '{', '}', '[', ']', '|', '/', '<', '>', '?',

			 ':', ',', '.', '\'', '\\'

		);

	return strtolower(str_replace($replace, "", $fieldname));

}

?>