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func.php
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/
func.php
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<?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. */
// Credit: http://stackoverflow.com/a/4694816/2087442
// Modified because of https://github.com/pi-hole/AdminLTE/pull/533
ini_set("pcre.recursion_limit", 1500);
function validDomain($domain_name, &$message = NULL)
{
if(!preg_match("/^((-|_)*[a-z\d]((-|_)*[a-z\d])*(-|_)*)(\.(-|_)*([a-z\d]((-|_)*[a-z\d])*))*$/i", $domain_name)) {
if($message !== NULL)
$message = "it contains invalid characters";
return false;
}
if(!preg_match("/^.{1,253}$/", $domain_name)) {
if($message !== NULL)
$message = "its length is invalid";
return false;
}
if(!preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name)) {
if($message !== NULL)
$message = "at least one label is of invalid length";
return false;
}
// everything is okay
return true;
}
function validDomainWildcard($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 && $labelLengthCheck ); //length of each label
}
function validIP($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;
}
function validCIDRIP($address){
// This validation strategy has been taken from ../js/groups-common.js
$isIPv6 = strpos($address, ":") !== false;
if($isIPv6) {
// One IPv6 element is 16bit: 0000 - FFFF
$v6elem = "[0-9A-Fa-f]{1,4}";
// CIDR for IPv6 is any multiple of 4 from 4 up to 128 bit
$v6cidr = "(4";
for ($i=8; $i <= 128; $i+=4) {
$v6cidr .= "|$i";
}
$v6cidr .= ")";
$validator = "/^(((?:$v6elem))((?::$v6elem))*::((?:$v6elem))((?::$v6elem))*|((?:$v6elem))((?::$v6elem)){7})\/$v6cidr$/";
return preg_match($validator, $address);
} else {
// One IPv4 element is 8bit: 0 - 256
$v4elem = "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)";
// Note that rev-server accepts only /8, /16, /24, and /32
$allowedv4cidr = "(8|16|24|32)";
$validator = "/^$v4elem\.$v4elem\.$v4elem\.$v4elem\/$allowedv4cidr$/";
return preg_match($validator, $address);
}
}
function validMAC($mac_addr)
{
// Accepted input format: 00:01:02:1A:5F:FF (characters may be lower case)
return !filter_var($mac_addr, FILTER_VALIDATE_MAC) === false;
}
function validEmail($email)
{
return filter_var($email, FILTER_VALIDATE_EMAIL)
// Make sure that the email does not contain special characters which
// may be used to execute shell commands, even though they may be valid
// in an email address. If the escaped email does not equal the original
// email, it is not safe to store in setupVars.
&& escapeshellcmd($email) === $email;
}
function get_ip_type($ip)
{
return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) ? 4 :
(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ? 6 :
0);
}
function checkfile($filename) {
if(is_readable($filename))
{
return $filename;
}
else
{
// substitute dummy file
return "/dev/null";
}
}
// Credit: http://php.net/manual/en/function.hash-equals.php#119576
if(!function_exists('hash_equals')) {
function hash_equals($known_string, $user_string) {
$ret = 0;
if (strlen($known_string) !== strlen($user_string)) {
$user_string = $known_string;
$ret = 1;
}
$res = $known_string ^ $user_string;
for ($i = strlen($res) - 1; $i >= 0; --$i) {
$ret |= ord($res[$i]);
}
return !$ret;
}
}
/**
* More safely execute a command with pihole shell script.
*
* For example,
*
* pihole_execute("-h");
*
* would execute command
*
* sudo pihole -h
*
* and returns output of that command as a string.
*
* @param $argument_string String of arguments to run pihole with.
* @param $error_on_failure If true, a warning is raised if command execution fails. Defaults to true.
*/
function pihole_execute($argument_string, $error_on_failure = true) {
$escaped = escapeshellcmd($argument_string);
$output = null;
$return_status = -1;
$command = "sudo pihole " . $escaped;
exec($command, $output, $return_status);
if($return_status !== 0)
{
trigger_error("Executing {$command} failed.", E_USER_WARNING);
}
return $output;
}
// Custom DNS
$customDNSFile = "/etc/pihole/custom.list";
function echoCustomDNSEntries()
{
$entries = getCustomDNSEntries();
$data = [];
foreach ($entries as $entry)
$data[] = [ $entry->domain, $entry->ip ];
return [ "data" => $data ];
}
function getCustomDNSEntries()
{
global $customDNSFile;
$entries = [];
$handle = fopen($customDNSFile, "r");
if ($handle)
{
while (($line = fgets($handle)) !== false) {
$line = str_replace("\r","", $line);
$line = str_replace("\n","", $line);
$explodedLine = explode (" ", $line);
if (count($explodedLine) != 2)
continue;
$data = new \stdClass();
$data->ip = $explodedLine[0];
$data->domain = $explodedLine[1];
$entries[] = $data;
}
fclose($handle);
}
return $entries;
}
function addCustomDNSEntry($ip="", $domain="", $json=true)
{
try
{
if(isset($_REQUEST['ip']))
$ip = trim($_REQUEST['ip']);
if(isset($_REQUEST['domain']))
$domain = trim($_REQUEST['domain']);
if (empty($ip))
return returnError("IP must be set", $json);
$ipType = get_ip_type($ip);
if (!$ipType)
return returnError("IP must be valid", $json);
if (empty($domain))
return returnError("Domain must be set", $json);
if (!validDomain($domain))
return returnError("Domain must be valid", $json);
// Only check for duplicates if adding new records from the web UI (not through Teleporter)
if(isset($_REQUEST['ip']) || isset($_REQUEST['domain']))
{
$existingEntries = getCustomDNSEntries();
foreach ($existingEntries as $entry)
if ($entry->domain == $domain && get_ip_type($entry->ip) == $ipType)
return returnError("This domain already has a custom DNS entry for an IPv" . $ipType, $json);
}
// Add record
pihole_execute("-a addcustomdns ".$ip." ".$domain);
return returnSuccess("", $json);
}
catch (\Exception $ex)
{
return returnError($ex->getMessage(), $json);
}
}
function deleteCustomDNSEntry()
{
try
{
$ip = !empty($_REQUEST['ip']) ? $_REQUEST['ip']: "";
$domain = !empty($_REQUEST['domain']) ? $_REQUEST['domain']: "";
if (empty($ip))
return returnError("IP must be set");
if (empty($domain))
return returnError("Domain must be set");
$existingEntries = getCustomDNSEntries();
$found = false;
foreach ($existingEntries as $entry)
if ($entry->domain == $domain)
if ($entry->ip == $ip) {
$found = true;
break;
}
if (!$found)
return returnError("This domain/ip association does not exist");
pihole_execute("-a removecustomdns ".$ip." ".$domain);
return returnSuccess();
}
catch (\Exception $ex)
{
return returnError($ex->getMessage());
}
}
function deleteAllCustomDNSEntries()
{
if (isset($customDNSFile))
{
$handle = fopen($customDNSFile, "r");
if ($handle)
{
try
{
while (($line = fgets($handle)) !== false) {
$line = str_replace("\r","", $line);
$line = str_replace("\n","", $line);
$explodedLine = explode (" ", $line);
if (count($explodedLine) != 2)
continue;
$ip = $explodedLine[0];
$domain = $explodedLine[1];
pihole_execute("-a removecustomdns ".$ip." ".$domain);
}
}
catch (\Exception $ex)
{
return returnError($ex->getMessage());
}
fclose($handle);
}
}
return returnSuccess();
}
// CNAME
$customCNAMEFile = "/etc/dnsmasq.d/05-pihole-custom-cname.conf";
function echoCustomCNAMEEntries()
{
$entries = getCustomCNAMEEntries();
$data = [];
foreach ($entries as $entry)
$data[] = [ $entry->domain, $entry->target ];
return [ "data" => $data ];
}
function getCustomCNAMEEntries()
{
global $customCNAMEFile;
$entries = [];
if (!file_exists($customCNAMEFile)) return $entries;
$handle = fopen($customCNAMEFile, "r");
if ($handle)
{
while (($line = fgets($handle)) !== false) {
$line = str_replace("cname=","", $line);
$line = str_replace("\r","", $line);
$line = str_replace("\n","", $line);
$explodedLine = explode (",", $line);
if (count($explodedLine) <= 1)
continue;
$data = new \stdClass();
$data->domains = array_slice($explodedLine, 0, -1);
$data->domain = implode(",", $data->domains);
$data->target = $explodedLine[count($explodedLine)-1];
$entries[] = $data;
}
fclose($handle);
}
return $entries;
}
function addCustomCNAMEEntry($domain="", $target="", $json=true)
{
try
{
if(isset($_REQUEST['domain']))
$domain = $_REQUEST['domain'];
if(isset($_REQUEST['target']))
$target = trim($_REQUEST['target']);
if (empty($domain))
return returnError("Domain must be set", $json);
if (empty($target))
return returnError("Target must be set", $json);
if (!validDomain($target))
return returnError("Target must be valid", $json);
// Check if each submitted domain is valid
$domains = array_map('trim', explode(",", $domain));
foreach ($domains as $d) {
if (!validDomain($d))
return returnError("Domain '$d' is not valid", $json);
}
$existingEntries = getCustomCNAMEEntries();
// Check if a record for one of the domains already exists
foreach ($existingEntries as $entry)
foreach ($domains as $d)
if (in_array($d, $entry->domains))
return returnError("There is already a CNAME record for '$d'", $json);
pihole_execute("-a addcustomcname ".$domain." ".$target);
return returnSuccess("", $json);
}
catch (\Exception $ex)
{
return returnError($ex->getMessage(), $json);
}
}
function deleteCustomCNAMEEntry()
{
try
{
$target = !empty($_REQUEST['target']) ? $_REQUEST['target']: "";
$domain = !empty($_REQUEST['domain']) ? $_REQUEST['domain']: "";
if (empty($target))
return returnError("Target must be set");
if (empty($domain))
return returnError("Domain must be set");
$existingEntries = getCustomCNAMEEntries();
$found = false;
foreach ($existingEntries as $entry)
if ($entry->domain == $domain)
if ($entry->target == $target) {
$found = true;
break;
}
if (!$found)
return returnError("This domain/ip association does not exist");
pihole_execute("-a removecustomcname ".$domain." ".$target);
return returnSuccess();
}
catch (\Exception $ex)
{
return returnError($ex->getMessage());
}
}
function deleteAllCustomCNAMEEntries()
{
try
{
$existingEntries = getCustomCNAMEEntries();
foreach ($existingEntries as $entry) {
pihole_execute("-a removecustomcname ".$entry->domain." ".$entry->target);
}
}
catch (\Exception $ex)
{
return returnError($ex->getMessage());
}
return returnSuccess();
}
function returnSuccess($message = "", $json = true)
{
if ($json) {
return [ "success" => true, "message" => $message ];
} else {
echo $message."<br>";
return true;
}
}
function returnError($message = "", $json = true)
{
$message = htmlentities($message) ;
if ($json) {
return [ "success" => false, "message" => $message ];
} else {
echo $message."<br>";
return false;
}
}
function getQueryTypeStr($querytype)
{
$qtypes = ["A (IPv4)", "AAAA (IPv6)", "ANY", "SRV", "SOA", "PTR", "TXT", "NAPTR", "MX", "DS", "RRSIG", "DNSKEY", "NS", "OTHER", "SVCB", "HTTPS"];
$qtype = intval($querytype);
if($qtype > 0 && $qtype <= count($qtypes))
return $qtypes[$qtype-1];
else
return "TYPE".($qtype - 100);
}
?>