<?php
/* Pi-hole: A black hole for Internet advertisements
*  (c) 2017 Pi-hole, LLC (https://pi-hole.net)
*  Network-wide ad blocking via your own hardware.
*
*  This file is copyright under the latest version of the EUPL.
*  Please see LICENSE file for your rights under this license. */ ?>

<?php

if(basename($_SERVER['SCRIPT_FILENAME']) !== "settings.php")
{
	die("Direct access to this script is forbidden!");
}

function validIP($address){
	if (preg_match('/[.:0]/', $address) && !preg_match('/[1-9a-f]/', $address)) {
		// Test if address contains either `:` or `0` but not 1-9 or a-f
		return false;
	}
	return !filter_var($address, FILTER_VALIDATE_IP) === false;
}

// Check for existance of variable
// and test it only if it exists
function istrue(&$argument) {
	$ret = false;
	if(isset($argument))
	{
		if($argument)
		{
			$ret = true;
		}
	}
	return $ret;
}

// Credit: http://stackoverflow.com/a/4694816/2087442
function validDomain($domain_name)
{
	$validChars = preg_match("/^([_a-z\d](-*[_a-z\d])*)(\.([_a-z\d](-*[a-z\d])*))*(\.([a-z\d])*)*$/i", $domain_name);
	$lengthCheck = preg_match("/^.{1,253}$/", $domain_name);
	$labelLengthCheck = preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name);
	return ( $validChars && $lengthCheck && $labelLengthCheck ); //length of each label
}

function validDomainWildcard($domain_name)
{
	// There has to be either no or at most one "*" at the beginning of a line
	$validChars = preg_match("/^((\*)?[_a-z\d](-*[_a-z\d])*)(\.([_a-z\d](-*[a-z\d])*))*(\.([a-z\d])*)*$/i", $domain_name);
	$lengthCheck = preg_match("/^.{1,253}$/", $domain_name);
	$labelLengthCheck = preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name);
	return ( $validChars && $lengthCheck && $labelLengthCheck ); //length of each label
}

function validMAC($mac_addr)
{
  // Accepted input format: 00:01:02:1A:5F:FF (characters may be lower case)
  return (preg_match('/([a-fA-F0-9]{2}[:]?){6}/', $mac_addr) == 1);
}

$dhcp_static_leases = array();
function readStaticLeasesFile()
{
	global $dhcp_static_leases;
	$dhcp_static_leases = array();
	$dhcpstatic = @fopen('/etc/dnsmasq.d/04-pihole-static-dhcp.conf', 'r');

	if(!is_resource($dhcpstatic))
		return false;

	while(!feof($dhcpstatic))
	{
		// Remove any possibly existing variable with this name
		$mac = ""; $one = ""; $two = "";
		sscanf(trim(fgets($dhcpstatic)),"dhcp-host=%[^,],%[^,],%[^,]",$mac,$one,$two);
		if(strlen($mac) > 0 && validMAC($mac))
		{
			if(validIP($one) && strlen($two) == 0)
				// dhcp-host=mac,IP - no HOST
				array_push($dhcp_static_leases,["hwaddr"=>$mac, "IP"=>$one, "host"=>""]);
			elseif(strlen($two) == 0)
				// dhcp-host=mac,hostname - no IP
				array_push($dhcp_static_leases,["hwaddr"=>$mac, "IP"=>"", "host"=>$one]);
			else
				// dhcp-host=mac,IP,hostname
				array_push($dhcp_static_leases,["hwaddr"=>$mac, "IP"=>$one, "host"=>$two]);
		}
		else if(validIP($one) && validDomain($mac))
		{
			// dhcp-host=hostname,IP - no MAC
			array_push($dhcp_static_leases,["hwaddr"=>"", "IP"=>$one, "host"=>$mac]);
		}
	}
	return true;
}

	$DNSserverslist = [
			"8.8.8.8" => "Google (Primary)",
			"208.67.222.222" => "OpenDNS (Primary)",
			"4.2.2.1" => "Level3 (Primary)",
			"199.85.126.10" => "Norton (Primary)",
			"8.26.56.26" => "Comodo (Primary)",
			"84.200.69.80" => "DNS.WATCH (Primary)",
			"8.8.4.4" => "Google (Secondary)",
			"208.67.220.220" => "OpenDNS (Secondary)",
			"4.2.2.2" => "Level3 (Secondary)",
			"199.85.127.10" => "Norton (Secondary)",
			"8.20.247.20" => "Comodo (Secondary)",
        	"84.200.70.40" => "DNS.WATCH (Secondary)",
		];

	$error = "";
	$success = "";

	if(isset($_POST["field"]))
	{
		// Process request
		switch ($_POST["field"]) {
			// Set DNS server
			case "DNS":

				$DNSservers = [];
				// Add selected predefined servers to list
				foreach ($DNSserverslist as $key => $value)
				{
					if(array_key_exists("DNSserver".str_replace(".","_",$key),$_POST))
					{
						array_push($DNSservers,$key);
					}
				}

				// Test custom server fields
				for($i=1;$i<=4;$i++)
				{
					if(array_key_exists("custom".$i,$_POST))
					{
						$IP = $_POST["custom".$i."val"];
						if(validIP($IP))
						{
							array_push($DNSservers,$IP);
						}
						else
						{
							$error .= "IP (".htmlspecialchars($IP).") is invalid!<br>";
						}
					}
				}

				// Check if at least one DNS server has been added
				if(count($DNSservers) < 1)
				{
					$error .= "No DNS server has been selected.<br>";
				}

				// Check if domain-needed is requested
				if(isset($_POST["DNSrequiresFQDN"]))
				{
					$extra = "domain-needed ";
				}
				else
				{
					$extra = "domain-not-needed ";
				}

				// Check if domain-needed is requested
				if(isset($_POST["DNSbogusPriv"]))
				{
					$extra .= "bogus-priv ";
				}
				else
				{
					$extra .= "no-bogus-priv ";
				}

				// Check if DNSSEC is requested
				if(isset($_POST["DNSSEC"]))
				{
					$extra .= "dnssec";
				}
				else
				{
					$extra .= "no-dnssec";
				}

				// If there has been no error we can save the new DNS server IPs
				if(!strlen($error))
				{
					$IPs = implode (",", $DNSservers);
					exec("sudo pihole -a setdns ".$IPs." ".$extra);
					$success .= "The DNS settings have been updated (using ".count($DNSservers)." DNS servers)";
				}
				else
				{
					$error .= "The settings have been reset to their previous values";
				}

				break;

			// Set query logging
			case "Logging":

				if($_POST["action"] === "Disable")
				{
					exec("sudo pihole -l off");
					$success .= "Logging has been disabled";
				}
				else
				{
					exec("sudo pihole -l on");
					$success .= "Logging has been enabled";
				}

				break;

			// Set domains to be excluded from being shown in Top Domains (or Ads) and Top Clients
			case "API":

				// Explode the contents of the textareas into PHP arrays
				// \n (Unix) and \r\n (Win) will be considered as newline
				// array_filter( ... ) will remove any empty lines
				$domains = array_filter(preg_split('/\r\n|[\r\n]/', $_POST["domains"]));
				$clients = array_filter(preg_split('/\r\n|[\r\n]/', $_POST["clients"]));

				$domainlist = "";
				$first = true;
				foreach($domains as $domain)
				{
					if(!validDomainWildcard($domain) || validIP($domain))
					{
						$error .= "Top Domains/Ads entry ".htmlspecialchars($domain)." is invalid (use only domains)!<br>";
					}
					if(!$first)
					{
						$domainlist .= ",";
					}
					else
					{
						$first = false;
					}
					$domainlist .= $domain;
				}

				$clientlist = "";
				$first = true;
				foreach($clients as $client)
				{
					if(!validDomainWildcard($client))
					{
						$error .= "Top Clients entry ".htmlspecialchars($client)." is invalid (use only IP addresses)!<br>";
					}
					if(!$first)
					{
						$clientlist .= ",";
					}
					else
					{
						$first = false;
					}
					$clientlist .= $client;
				}

				// Set Top Lists options
				if(!strlen($error))
				{
					// All entries are okay
					exec("sudo pihole -a setexcludedomains ".$domainlist);
					exec("sudo pihole -a setexcludeclients ".$clientlist);
					$success .= "The API settings have been updated<br>";
				}
				else
				{
					$error .= "The settings have been reset to their previous values";
				}

				// Set query log options
				if(isset($_POST["querylog-permitted"]) && isset($_POST["querylog-blocked"]))
				{
					exec("sudo pihole -a setquerylog all");
					if(!isset($_POST["privacyMode"]))
					{
						$success .= "All entries will be shown in Query Log";
					}
					else
					{
						$success .= "Only blocked entries will be shown in Query Log";
					}
				}
				elseif(isset($_POST["querylog-permitted"]))
				{
					exec("sudo pihole -a setquerylog permittedonly");
					if(!isset($_POST["privacyMode"]))
					{
						$success .= "Only permitted will be shown in Query Log";
					}
					else
					{
						$success .= "No entries will be shown in Query Log";
					}
				}
				elseif(isset($_POST["querylog-blocked"]))
				{
					exec("sudo pihole -a setquerylog blockedonly");
					$success .= "Only blocked entries will be shown in Query Log";
				}
				else
				{
					exec("sudo pihole -a setquerylog nothing");
					$success .= "No entries will be shown in Query Log";
				}


				if(isset($_POST["privacyMode"]))
				{
					exec("sudo pihole -a privacymode true");
					$success .= " (privacy mode enabled)";
				}
				else
				{
					exec("sudo pihole -a privacymode false");
				}

				break;

			case "webUI":
				if($_POST["tempunit"] == "F")
				{
					exec('sudo pihole -a -f');
				}
				elseif($_POST["tempunit"] == "K")
				{
					exec('sudo pihole -a -k');
				}
				else
				{
					exec('sudo pihole -a -c');
				}
				if(isset($_POST["boxedlayout"]))
				{
					exec('sudo pihole -a layout boxed');
				}
				else
				{
					exec('sudo pihole -a layout traditional');
				}
				$success .= "The webUI settings have been updated";
				break;

			case "reboot":
				exec("sudo pihole -a reboot");
				$success = "The system will reboot in 5 seconds...";
				break;

			case "restartdns":
				exec("sudo pihole -a restartdns");
				$success = "The DNS server has been restarted";
				break;

			case "flushlogs":
				exec("sudo pihole -f");
				$success = "The Pi-Hole log file has been flushed";
				break;

			case "DHCP":

				if(isset($_POST["addstatic"]))
				{
					$mac = $_POST["AddMAC"];
					$ip = $_POST["AddIP"];
					$hostname = $_POST["AddHostname"];

					if(!validMAC($mac))
					{
						$error .= "MAC address (".htmlspecialchars($mac).") is invalid!<br>";
					}
					$mac = strtoupper($mac);

					if(!validIP($ip) && strlen($ip) > 0)
					{
						$error .= "IP address (".htmlspecialchars($ip).") is invalid!<br>";
					}

					if(!validDomain($hostname) && strlen($hostname) > 0)
					{
						$error .= "Host name (".htmlspecialchars($hostname).") is invalid!<br>";
					}

					if(strlen($hostname) == 0 && strlen($ip) == 0)
					{
						$error .= "You can not omit both the IP address and the host name!<br>";
					}

					if(strlen($hostname) == 0)
						$hostname = "nohost";

					if(strlen($ip) == 0)
						$ip = "noip";

					// Test if this MAC address is already included
					readStaticLeasesFile();
					foreach($dhcp_static_leases as $lease) {
						if($lease["hwaddr"] === $mac)
						{
							$error .= "Static release for MAC address (".htmlspecialchars($mac).") already defined!<br>";
							break;
						}
					}

					if(!strlen($error))
					{
						exec("sudo pihole -a addstaticdhcp ".$mac." ".$ip." ".$hostname);
						$success .= "A new static address has been added";
					}
					break;
				}

				if(isset($_POST["removestatic"]))
				{
					$mac = $_POST["removestatic"];
					if(!validMAC($mac))
					{
						$error .= "MAC address (".htmlspecialchars($mac).") is invalid!<br>";
					}
					$mac = strtoupper($mac);

					if(!strlen($error))
					{
						exec("sudo pihole -a removestaticdhcp ".$mac);
						$success .= "The static address with MAC address ".htmlspecialchars($mac)." has been removed";
					}
					break;
				}

				if(isset($_POST["active"]))
				{
					// Validate from IP
					$from = $_POST["from"];
					if (!validIP($from))
					{
						$error .= "From IP (".htmlspecialchars($from).") is invalid!<br>";
					}

					// Validate to IP
					$to = $_POST["to"];
					if (!validIP($to))
					{
						$error .= "To IP (".htmlspecialchars($to).") is invalid!<br>";
					}

					// Validate router IP
					$router = $_POST["router"];
					if (!validIP($router))
					{
						$error .= "Router IP (".htmlspecialchars($router).") is invalid!<br>";
					}

					$domain = $_POST["domain"];

					// Validate Domain name
					if(!validDomain($domain))
					{
						$error .= "Domain name ".htmlspecialchars($domain)." is invalid!<br>";
					}

					$leasetime = $_POST["leasetime"];

					// Validate Lease time length
					if(!is_numeric($leasetime) || intval($leasetime) < 0)
					{
						$error .= "Lease time ".htmlspecialchars($leasetime)." is invalid!<br>";
					}

					if(isset($_POST["useIPv6"]))
					{
						$ipv6 = "true";
						$type = "(IPv4 + IPv6)";
					}
					else
					{
						$ipv6 = "false";
						$type = "(IPv4)";
					}

					if(!strlen($error))
					{
						exec("sudo pihole -a enabledhcp ".$from." ".$to." ".$router." ".$leasetime." ".$domain." ".$ipv6);
						$success .= "The DHCP server has been activated ".htmlspecialchars($type);
					}
				}
				else
				{
					exec("sudo pihole -a disabledhcp");
					$success = "The DHCP server has been deactivated";
				}

				break;

			default:
				// Option not found
				$debug = true;
				break;
		}
	}

	// Credit: http://stackoverflow.com/a/5501447/2087442
	function formatSizeUnits($bytes)
	{
		if ($bytes >= 1073741824)
		{
			$bytes = number_format($bytes / 1073741824, 2) . ' GB';
		}
		elseif ($bytes >= 1048576)
		{
			$bytes = number_format($bytes / 1048576, 2) . ' MB';
		}
		elseif ($bytes >= 1024)
		{
			$bytes = number_format($bytes / 1024, 2) . ' kB';
		}
		elseif ($bytes > 1)
		{
			$bytes = $bytes . ' bytes';
		}
		elseif ($bytes == 1)
		{
			$bytes = $bytes . ' byte';
		}
		else
		{
			$bytes = '0 bytes';
		}

		return $bytes;
	}
?>