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<?php
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/* $Id$ */
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/*
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util.inc
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part of m0n0wall (http://m0n0.ch/wall)
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Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* kill a process by pid file */
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function killbypid($pidfile) {
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sigkillbypid($pidfile, "TERM");
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}
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/* sigkill a process by pid file */
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function sigkillbypid($pidfile, $sig) {
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if (file_exists($pidfile)) {
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mwexec("/bin/kill -s $sig `/bin/cat " . $pidfile . "`");
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}
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}
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/* kill a process by name */
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function killbyname($procname) {
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mwexec("/usr/bin/killall " . escapeshellarg($procname));
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}
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/* return the subnet address given a host address and a subnet bit count */
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function gen_subnet($ipaddr, $bits) {
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if (!is_ipaddr($ipaddr) || !is_numeric($bits))
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return "";
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return long2ip(ip2long($ipaddr) & gen_subnet_mask_long($bits));
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}
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/* return the highest (broadcast) address in the subnet given a host address and a subnet bit count */
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function gen_subnet_max($ipaddr, $bits) {
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if (!is_ipaddr($ipaddr) || !is_numeric($bits))
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return "";
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return long2ip(ip2long($ipaddr) | ~gen_subnet_mask_long($bits));
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}
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/* returns a subnet mask (long given a bit count) */
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function gen_subnet_mask_long($bits) {
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$sm = 0;
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for ($i = 0; $i < $bits; $i++) {
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$sm >>= 1;
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$sm |= 0x80000000;
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}
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return $sm;
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}
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/* same as above but returns a string */
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function gen_subnet_mask($bits) {
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return long2ip(gen_subnet_mask_long($bits));
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}
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function is_numericint($arg) {
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return (preg_match("/[^0-9]/", $arg) ? false : true);
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}
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/* returns true if $ipaddr is a valid dotted IPv4 address */
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function is_ipaddr($ipaddr) {
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if (!is_string($ipaddr))
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return false;
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$ip_long = ip2long($ipaddr);
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$ip_reverse = long2ip($ip_long);
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if ($ipaddr == $ip_reverse)
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return true;
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else
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return false;
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}
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/* returns true if $ipaddr is a valid dotted IPv4 address or an alias thereof */
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function is_ipaddroralias($ipaddr) {
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global $aliastable, $config;
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if(!$config['aliases']['alias'])
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return;
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foreach($config['aliases']['alias'] as $alias) {
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if($alias['name'] == $ipaddr)
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return true;
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}
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if (isset($aliastable[$ipaddr]) && is_ipaddr($aliastable[$ipaddr]))
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return true;
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else
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return is_ipaddr($ipaddr);
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}
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/* returns true if $ipaddr is a valid dotted IPv4 address or any alias */
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function is_ipaddroranyalias($ipaddr) {
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global $aliastable;
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if (isset($aliastable[$ipaddr]))
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return true;
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else
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return is_ipaddr($ipaddr);
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}
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/* returns true if $subnet is a valid subnet in CIDR format */
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function is_subnet($subnet) {
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if (!is_string($subnet))
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return false;
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list($hp,$np) = explode('/', $subnet);
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if (!is_ipaddr($hp))
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return false;
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if (!is_numeric($np) || ($np < 1) || ($np > 32))
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return false;
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return true;
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}
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/* returns true if $subnet is a valid subnet in CIDR format or an alias thereof */
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function is_subnetoralias($subnet) {
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global $aliastable;
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if (isset($aliastable[$subnet]) && is_subnet($aliastable[$subnet]))
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return true;
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else
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return is_subnet($subnet);
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}
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/* returns true if $hostname is a valid hostname */
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function is_hostname($hostname) {
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if (!is_string($hostname))
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return false;
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if (preg_match("/^[a-z0-9\-]+$/i", $hostname))
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return true;
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else
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return false;
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}
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/* returns true if $domain is a valid domain name */
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function is_domain($domain) {
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if (!is_string($domain))
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return false;
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if (preg_match("/^([a-z0-9\-]+\.?)*$/i", $domain))
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return true;
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else
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return false;
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}
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/* returns true if $uname is a valid DynDNS username */
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function is_dyndns_username($uname) {
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if (!is_string($uname))
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return false;
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if (preg_match("/[^a-z0-9\-.@_]/i", $uname))
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return false;
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else
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return true;
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}
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/* returns true if $macaddr is a valid MAC address */
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function is_macaddr($macaddr) {
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if (!is_string($macaddr))
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return false;
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$maca = explode(":", $macaddr);
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if (count($maca) != 6)
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return false;
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foreach ($maca as $macel) {
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if (($macel === "") || (strlen($macel) > 2))
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return false;
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if (preg_match("/[^0-9a-f]/i", $macel))
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return false;
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}
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return true;
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}
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/* returns true if $name is a valid name for an alias */
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function is_validaliasname($name) {
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if (!preg_match("/[^a-zA-Z0-9]/", $name))
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return true;
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else
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return false;
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}
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/* returns true if $port is a valid TCP/UDP port */
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function is_port($port) {
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if (!is_numericint($port))
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return false;
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if (($port < 1) || ($port > 65535))
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return false;
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else
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return true;
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}
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/* returns a list of interfaces with MAC addresses
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(skips VLAN and other virtual interfaces) */
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function get_interface_list() {
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/* build interface list with netstat */
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exec("/usr/bin/netstat -inW -f link", $linkinfo);
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array_shift($linkinfo);
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$iflist = array();
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foreach ($linkinfo as $link) {
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$alink = preg_split("/\s+/", $link);
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$ifname = chop($alink[0]);
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if (substr($ifname, -1) == "*")
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$ifname = substr($ifname, 0, strlen($ifname) - 1);
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if (!preg_match("/^(plip|pflog|ppp|sl|gif|faith|lo|ng|vlan)/", $ifname)) {
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$iflist[$ifname] = array();
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$iflist[$ifname]['mac'] = chop($alink[3]);
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$iflist[$ifname]['up'] = false;
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/* find out if the link on this interface is up */
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unset($ifinfo);
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exec("/sbin/ifconfig {$ifname}", $ifinfo);
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foreach ($ifinfo as $ifil) {
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if (preg_match("/status: (.*)$/", $ifil, $matches)) {
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if ($matches[1] == "active")
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$iflist[$ifname]['up'] = true;
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break;
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}
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}
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}
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}
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return $iflist;
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}
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/* wrapper for exec() */
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function mwexec($command) {
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global $g;
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if ($g['debug']) {
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if (!$_SERVER['REMOTE_ADDR'])
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echo "mwexec(): $command\n";
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passthru($command, $retval);
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} else {
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exec("$command > /dev/null 2>&1", $oarr, $retval);
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}
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return $retval;
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}
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/* wrapper for exec() in background */
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function mwexec_bg($command) {
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global $g;
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if ($g['debug']) {
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if (!$_SERVER['REMOTE_ADDR'])
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echo "mwexec(): $command\n";
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}
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exec("nohup $command > /dev/null 2>&1 &");
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}
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/* unlink a file, if it exists */
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function unlink_if_exists($fn) {
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$to_do = glob($fn);
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if(is_array($to_do)) {
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foreach($to_do as $filename)
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@unlink($filename);
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} else {
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@unlink($fn);
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}
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}
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/* make a global alias table (for faster lookups) */
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function alias_make_table($config) {
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global $aliastable;
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$aliastable = array();
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if (is_array($config['aliases']['alias'])) {
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foreach ($config['aliases']['alias'] as $alias) {
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if ($alias['name'])
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$aliastable[$alias['name']] = $alias['address'];
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}
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}
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}
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/* check if an alias exists */
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function is_alias($name) {
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global $aliastable;
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325
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326
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return isset($aliastable[$name]);
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}
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329
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/* expand a host or network alias, if necessary */
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330
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function alias_expand($name) {
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332
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global $aliastable;
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333
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334
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if (isset($aliastable[$name]))
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return $aliastable[$name];
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336
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else if (is_ipaddr($name) || is_subnet($name))
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return $name;
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else
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339
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return null;
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340
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}
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341
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342
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/* expand a host alias, if necessary */
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343
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function alias_expand_host($name) {
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344
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345
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global $aliastable;
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346
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347
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if (isset($aliastable[$name]) && is_ipaddr($aliastable[$name]))
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348
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return $aliastable[$name];
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349
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else if (is_ipaddr($name))
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350
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return $name;
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351
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else
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352
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return null;
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353
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}
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354
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355
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/* expand a network alias, if necessary */
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356
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function alias_expand_net($name) {
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357
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358
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global $aliastable;
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359
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360
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if (isset($aliastable[$name]) && is_subnet($aliastable[$name]))
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361
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return $aliastable[$name];
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362
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else if (is_subnet($name))
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363
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return $name;
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364
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else
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365
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return null;
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366
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}
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367
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368
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/* find out whether two subnets overlap */
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369
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function check_subnets_overlap($subnet1, $bits1, $subnet2, $bits2) {
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370
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371
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if (!is_numeric($bits1))
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372
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$bits1 = 32;
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373
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if (!is_numeric($bits2))
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$bits2 = 32;
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375
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376
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if ($bits1 < $bits2)
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$relbits = $bits1;
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else
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379
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$relbits = $bits2;
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380
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381
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$sn1 = gen_subnet_mask_long($relbits) & ip2long($subnet1);
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$sn2 = gen_subnet_mask_long($relbits) & ip2long($subnet2);
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383
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384
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if ($sn1 == $sn2)
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385
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return true;
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else
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387
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return false;
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388
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}
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389
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390
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/* compare two IP addresses */
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391
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function ipcmp($a, $b) {
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392
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if (ip2long($a) < ip2long($b))
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393
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return -1;
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394
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else if (ip2long($a) > ip2long($b))
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395
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return 1;
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396
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else
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397
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return 0;
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398
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}
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|
399
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400
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/* return true if $addr is in $subnet, false if not */
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|
401
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function ip_in_subnet($addr,$subnet) {
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402
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list($ip, $mask) = explode('/', $subnet);
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403
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$mask = 0xffffffff << (32 - $mask);
|
|
404
|
return ((ip2long($addr) & $mask) == (ip2long($ip) & $mask));
|
|
405
|
}
|
|
406
|
|
|
407
|
/* verify (and remove) the digital signature on a file - returns 0 if OK */
|
|
408
|
function verify_digital_signature($fname) {
|
|
409
|
|
|
410
|
global $g;
|
|
411
|
|
|
412
|
return mwexec("/usr/local/bin/verifysig " .
|
|
413
|
escapeshellarg("{$g['etc_path']}/pubkey.pem") . " " .
|
|
414
|
escapeshellarg($fname));
|
|
415
|
}
|
|
416
|
|
|
417
|
/* obtain MAC address given an IP address by looking at the ARP table */
|
|
418
|
function arp_get_mac_by_ip($ip) {
|
|
419
|
mwexec("/sbin/ping -c 1 -t 1 {$ip}");
|
|
420
|
exec("/usr/sbin/arp -n {$ip}", $arpoutput);
|
|
421
|
|
|
422
|
if ($arpoutput[0]) {
|
|
423
|
$arpi = explode(" ", $arpoutput[0]);
|
|
424
|
$macaddr = $arpi[3];
|
|
425
|
if (is_macaddr($macaddr))
|
|
426
|
return $macaddr;
|
|
427
|
else
|
|
428
|
return false;
|
|
429
|
}
|
|
430
|
|
|
431
|
return false;
|
|
432
|
}
|
|
433
|
|
|
434
|
/* return a fieldname that is safe for xml usage */
|
|
435
|
function xml_safe_fieldname($fieldname) {
|
|
436
|
$replace = array('/', '-', ' ', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
|
|
437
|
'_', '+', '=', '{', '}', '[', ']', '|', '/', '<', '>', '?',
|
|
438
|
':', ',', '.', '\'', '\\'
|
|
439
|
);
|
|
440
|
return strtolower(str_replace($replace, "", $fieldname));
|
|
441
|
}
|
|
442
|
|
|
443
|
?>
|