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<?php
/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
namespace Icinga\Protocol;
/**
* Discover dns records using regular or reverse lookup
*/
class Dns
{
/**
* Discover all service records on a given domain
*
* @param string $domain The domain to search
* @param string $service The type of the service, like for example 'ldaps' or 'ldap'
* @param string $protocol The transport protocol used by the service, defaults to 'tcp'
*
* @return array An array of all found service records
*/
public static function getSrvRecords($domain, $service, $protocol = 'tcp')
{
$records = dns_get_record('_' . $service . '._' . $protocol . '.' . $domain, DNS_SRV);
return $records === false ? array() : $records;
}
/**
* Get all ldap records for the given domain
*
* @param string $query The domain to query
* @param int $type The type of DNS-entry to fetch, see
* http://www.php.net/manual/de/function.dns-get-record.php for available types
*
* @return array|null An array of record entries
*/
public static function records($query, $type = DNS_ANY)
{
return dns_get_record($query, $type);
}
/**
* Reverse lookup all host names available on the given ip address
*
* @param string $ipAddress
* @param int $type
*
* @return array|null
*/
public static function ptr($ipAddress, $type = DNS_ANY)
{
$host = gethostbyaddr($ipAddress);
if ($host === false || $host === $ipAddress) {
// malformed input or no host found
return null;
}
return self::records($host, $type);
}
/**
* Get the IPv4 address of the given hostname.
*
* @param $hostname The hostname to resolve
*
* @return string|null The IPv4 address of the given hostname or null, when no entry exists.
*/
public static function ipv4($hostname)
{
$records = dns_get_record($hostname, DNS_A);
if ($records !== false && count($records) > 0) {
return $records[0]['ip'];
}
return null;
}
/**
* Get the IPv6 address of the given hostname.
*
* @param $hostname The hostname to resolve
*
* @return string|null The IPv6 address of the given hostname or null, when no entry exists.
*/
public static function ipv6($hostname)
{
$records = dns_get_record($hostname, DNS_AAAA);
if ($records !== false && count($records) > 0) {
return $records[0]['ip'];
}
return null;
}
}
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