.
*/
// **************************************************************************************************************
//
// The purpose of this script is to dynamically remove hosts from your local network. Well, hosts won't actually
// be kicked off the network, but they will be moved into the unknown hosts pool. See add_host.php for more info.
// Hosts can be removed individually, or more interesting, hosts can be removed after their expiration date if
// you have added hosts using the add_host.php script and set an expiration date. To do this automatically, maybe
// add a script to your hourly cron like the following:
//
// #!/bin/sh
// wget -O - http://username:password@localhost/secure/rm_host.php?old=true > /dev/null 2>&1
//
// And boom! You can temporarily add hosts to the known pool of your local network and have them auto-expire
//
// **************************************************************************************************************
// **************************************************************************************************************
//
// Apache will need to be able to sudo your dhcpd init script, and write to dhcpd.conf and the hosts file:
// visudo: www-data ALL=NOPASSWD: /etc/init.d/dhcp3-server
//
// **************************************************************************************************************
$dhcpd_conf_path = "/etc/dhcp3/dhcpd.conf";
$dhcpd_init_path = "/etc/init.d/dhcp3-server";
$hosts_path = "/etc/hosts";
$admin = str_replace("!", "@", "root!jusme.org");
print "\n";
print "\n";
print "Remove Host\n";
print "\n";
print "\n";
print "\n";
if ($_GET["old"] == "true")
{
$removed = array();
$hosts = $orig_hosts = file_get_contents($hosts_path);
$dhcpd = $orig_dhcpd = file_get_contents($dhcpd_conf_path);
// Match time-limited hostnames
$num = preg_match_all("/ (.+)_(\d+)_(\d+)_(\d+)_(\d+)_(\d+)/", $hosts, $matches);
for ($i = 0; $i < $num; $i++)
{
$name = $matches[1][$i];
// Convert back to proper timestamp format
$time = strtotime($matches[2][$i] . "/" . $matches[3][$i] . "/" . $matches[4][$i] . " " . $matches[5][$i] . ":" . $matches[6][$i]);
// If the current time is past the expiration date for this hostname
if (time() >= $time)
{
// Remove hostname
$hosts = preg_replace("/\d+\.\d+\.\d+\.\d+\t$name( .*)?\\n/U", "", $hosts);
$dhcpd = preg_replace("/host $name\\n{.*}\\n/sU", "", $dhcpd);
$removed[] = $name;
}
}
file_put_contents($hosts_path, $hosts);
file_put_contents($dhcpd_conf_path, $dhcpd);
passthru("sudo $dhcpd_init_path restart", $ret);
// Restarting dhcpd failed, probably malformed conf file
if ($ret != 0)
{
// Revert back to previous data, which presumably was working before
file_put_contents($hosts_path, $orig_hosts);
file_put_contents($dhcpd_conf_path, $orig_dhcpd);
passthru("sudo $dhcpd_init_path restart", $ret);
// Send a warning email to the administrator
system("echo 'Remove old hosts failed!' | mail -s 'DHCPD' $admin");
die('DHCPD restart failed!');
}
if (!empty($removed))
{
print "
Old hosts removed:\n";
foreach ($removed as $name)
print " $name\n";
}
}
elseif ($_GET["submit"] == "true")
{
$name = $_POST["name"];
$dhcpd = $orig_dhcpd = file_get_contents($dhcpd_conf_path);
$dhcpd = preg_replace("/host $name\\n{.*}\\n/sU", "", $dhcpd);
file_put_contents($dhcpd_conf_path, $dhcpd);
passthru("sudo $dhcpd_init_path restart", $ret);
// Restarting dhcpd failed, probably malformed conf file
if ($ret != 0)
{
// Revert back to previous data, which presumably was working before
file_put_contents($dhcpd_conf_path, $orig_dhcpd);
passthru("sudo $dhcpd_init_path restart", $ret);
die('DHCPD restart failed!');
}
$hosts = file_get_contents($hosts_path);
$hosts = preg_replace("/\d+\.\d+\.\d+\.\d+\t$name( .*)?\\n/U", "", $hosts);
file_put_contents($hosts_path, $hosts);
print "