<?php

/*
Copyright (c) 2009, Falko Timme, Till Brehm, projektfarm Gmbh
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name of ISPConfig nor the names of its contributors
      may be used to endorse or promote products derived from this software without
      specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
TABLE STRUCTURE of the "named" database:

CREATE TABLE IF NOT EXISTS `records` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `zone` varchar(255) NOT NULL,
  `ttl` int(11) NOT NULL default '86400',
  `type` varchar(255) NOT NULL,
  `host` varchar(255) NOT NULL default '@',
  `mx_priority` int(11) default NULL,
  `data` text,
  `primary_ns` varchar(255) default NULL,
  `resp_contact` varchar(255) default NULL,
  `serial` bigint(20) default NULL,
  `refresh` int(11) default NULL,
  `retry` int(11) default NULL,
  `expire` int(11) default NULL,
  `minimum` int(11) default NULL,
  `ispconfig_id` int(11) NOT NULL,
  PRIMARY KEY  (`id`),
  KEY `type` (`type`),
  KEY `host` (`host`),
  KEY `zone` (`zone`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;

CREATE TABLE IF NOT EXISTS `xfr` (
  `id` int(11) NOT NULL auto_increment,
  `zone` varchar(255) NOT NULL,
  `client` varchar(255) NOT NULL,
  `ispconfig_id` int(11) NOT NULL,
  PRIMARY KEY  (`id`),
  KEY `zone` (`zone`),
  KEY `client` (`client`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;

*/

class bind_dlz_plugin {

	var $plugin_name = 'bind_dlz_plugin';
	var $class_name  = 'bind_dlz_plugin';

	//* This function is called during ispconfig installation to determine
	//  if a symlink shall be created for this plugin.
	function onInstall()
	{
		global $conf;

		if(isset($conf['bind']['installed']) && $conf['bind']['installed'] == true) {
			// Temporarily disabled until the installer supports the automatic creation of the necessary
			// database or at least to select between filebased nd db based bind, as not all bind versions
			// support dlz out of the box. To enable this plugin manually, create a symlink from the plugins-enabled
			// directory to this file in the plugins-available directory.
			return false;
			//return true;
		} else {
			return false;
		}

	}

	/*
	 	This function is called when the plugin is loaded
	*/

	function onLoad()
	{
		global $app;

		/*
		Register for the events
		*/

		//* SOA
		$app->plugins->registerEvent('dns_soa_insert', $this->plugin_name, 'soa_insert');
		$app->plugins->registerEvent('dns_soa_update', $this->plugin_name, 'soa_update');
		$app->plugins->registerEvent('dns_soa_delete', $this->plugin_name, 'soa_delete');

		//* RR
		$app->plugins->registerEvent('dns_rr_insert', $this->plugin_name, 'rr_insert');
		$app->plugins->registerEvent('dns_rr_update', $this->plugin_name, 'rr_update');
		$app->plugins->registerEvent('dns_rr_delete', $this->plugin_name, 'rr_delete');
	}


	function soa_insert($event_name, $data)
	{
		global $app, $conf;

		if($data["new"]["active"] != 'Y') return;

		$origin = substr($data["new"]["origin"], 0, -1);
		$ispconfig_id = $data["new"]["id"];
		$serial = $app->db->queryOneRecord("SELECT * FROM dns_soa WHERE id = ".$ispconfig_id);

		$ttl = $data["new"]["ttl"];

		//$_db = clone $app->db;
		//$_db->dbName = 'named';

		$app->db->query("INSERT INTO named.records (zone, ttl, type, primary_ns, resp_contact, serial, refresh, retry, expire, minimum, ispconfig_id) VALUES ".
			"('$origin', $ttl, 'SOA', '{$data["new"]["ns"]}', '{$data["new"]["mbox"]}', '{$serial["serial"]}', '{$serial["refresh"]}'," .
			"'{$serial["retry"]}', '{$serial["expire"]}', '{$serial["minimum"]}', $ispconfig_id)");
		//unset($_db);
	}

	function soa_update($event_name, $data)
	{
		global $app, $conf;

		if($data["new"]["active"] != 'Y')
		{
			if($data["old"]["active"] != 'Y') return;
			$this->soa_delete($event_name, $data);
		}
		else
		{
			if($data["old"]["active"] == 'Y')
			{
				$origin = substr($data["new"]["origin"], 0, -1);
				$ispconfig_id = $data["new"]["id"];
				$serial = $app->db->queryOneRecord("SELECT * FROM dns_soa WHERE id = ".$ispconfig_id);

				$ttl = $data["new"]["ttl"];

				//$_db = clone $app->db;
				//$_db->dbName = 'named';

				$app->db->query("UPDATE named.records SET zone = '$origin', ttl = $ttl, primary_ns = '{$data["new"]["ns"]}', resp_contact = '{$data["new"]["mbox"]}', ".
					"serial = '{$serial["serial"]}', refresh = '{$serial["refresh"]}', retry = '{$serial["retry"]}', expire = '{$serial["expire"]}', ".
					"minimum = '{$serial["minimum"]}' WHERE ispconfig_id = ".$data["new"]["id"]." AND type = 'SOA'");
				//unset($_db);
			}
			else
			{
				$this->soa_insert($event_name, $data);
				$ispconfig_id = $data["new"]["id"];

				if ($records = $app->db->queryAllRecords("SELECT * FROM dns_rr WHERE zone = $ispconfig_id AND active = 'Y'"))
				{
					foreach($records as $record)
					{
						foreach ($record as $key => $val) {
							$data["new"][$key] = $val;
						}
						$this->rr_insert("dns_rr_insert", $data);
					}
				}
			}
		}

	}

	function soa_delete($event_name, $data)
	{
		global $app, $conf;

		//$_db = clone $app->db;
		//$_db->dbName = 'named';

		$app->db->query( "DELETE FROM named.dns_records WHERE zone = '".substr($data['old']['origin'], 0, -1)."'");
		//unset($_db);
	}

	function rr_insert($event_name, $data)
	{
		global $app, $conf;
		if($data["new"]["active"] != 'Y') return;

		$zone = $app->db->queryOneRecord("SELECT * FROM dns_soa WHERE id = ".$data["new"]["zone"]);
		$origin = substr($zone["origin"], 0, -1);
		$ispconfig_id = $data["new"]["id"];

		$type = $data["new"]["type"];

		if (substr($data["new"]["name"], -1) == '.') {
			$name = substr($data["new"]["name"], 0, -1);
		} else {
			$name = ($data["new"]["name"] == "") ? $name = '@' : $data["new"]["name"];
		}

		if ($name == $origin || $name == '') {
			$name = '@';
		}

		switch ($type)
		{
		case "CNAME":
		case "MX":
		case "NS":
		case "ALIAS":
		case "PTR":
		case "SRV":
			if(substr($data["new"]["data"], -1) != '.'){
				$content = $data["new"]["data"] . '.';
			} else {
				$content = $data["new"]["data"];
			}
			break;
		case "HINFO":
			$content = $data["new"]["data"];
			$quote1 = strpos($content, '"');

			if($quote1 !== FALSE) {
				$quote2 = strpos(substr($content, ($quote1 + 1)), '"');
			}

			if ($quote1 !== FALSE && $quote2 !== FALSE) {
				$text_between_quotes = str_replace(' ', '_', substr($content, ($quote1 + 1), (($quote2 - $quote1))));
				$content = $text_between_quotes.substr($content, ($quote2 + 2));
			}
			break;
		default:
			$content = $data["new"]["data"];
		}

		$ttl = $data["new"]["ttl"];

		//$_db = clone $app->db;
		//$_db->dbName = 'named';

		if ($type == 'MX') {
			$app->db->query("INSERT INTO named.records (zone, ttl, type, host, mx_priority, data, ispconfig_id)".
				" VALUES ('$origin', $ttl, '$type', '$name', {$data["new"]["aux"]}, '$content', $ispconfig_id)");
		} elseif ($type == 'SRV') {
			$app->db->query("INSERT INTO named.records (zone, ttl, type, data, ispconfig_id)".
				" VALUES ('$origin', $ttl, '$type', '{$data["new"]["aux"]} $content', $ispconfig_id)");
		} else {
			$app->db->query("INSERT INTO named.records (zone, ttl, type, host, data, ispconfig_id)".
				" VALUES ('$origin', $ttl, '$type', '$name', '$content', $ispconfig_id)");
		}

		//unset($_db);
	}

	function rr_update($event_name, $data)
	{
		global $app, $conf;

		if ($data["new"]["active"] != 'Y')
		{
			if($data["old"]["active"] != 'Y') return;
			$this->rr_delete($event_name, $data);
		}
		else
		{
			if ($data["old"]["active"] == 'Y')
			{
				$zone = $app->db->queryOneRecord("SELECT * FROM dns_soa WHERE id = ".$data["new"]["zone"]);
				$origin = substr($zone["origin"], 0, -1);
				$ispconfig_id = $data["new"]["id"];

				$type = $data["new"]["type"];

				if (substr($data["new"]["name"], -1) == '.') {
					$name = substr($data["new"]["name"], 0, -1);
				} else {
					$name = ($data["new"]["name"] == "") ? $name = '@' : $data["new"]["name"];
				}

				if ($name == $origin || $name == '') {
					$name = '@';
				}

				switch ($type)
				{
				case "CNAME":
				case "MX":
				case "NS":
				case "ALIAS":
				case "PTR":
				case "SRV":
					if(substr($data["new"]["data"], -1) != '.'){
						$content = $data["new"]["data"] . '.';
					} else {
						$content = $data["new"]["data"];
					}
					break;
				case "HINFO":
					$content = $data["new"]["data"];
					$quote1 = strpos($content, '"');
					if($quote1 !== FALSE){
						$quote2 = strpos(substr($content, ($quote1 + 1)), '"');
					}
					if($quote1 !== FALSE && $quote2 !== FALSE){
						$text_between_quotes = str_replace(' ', '_', substr($content, ($quote1 + 1), (($quote2 - $quote1))));
						$content = $text_between_quotes.substr($content, ($quote2 + 2));
					}
					break;
				default:
					$content = $data["new"]["data"];
				}

				$ttl = $data["new"]["ttl"];
				$prio = (int)$data["new"]["aux"];

				//$_db = clone $app->db;
				//$_db->dbName = 'named';

				if ($type == 'MX') {
					$app->db->query("UPDATE named.records SET zone = '$origin', ttl = $ttl, type = '$type', host = '$name', mx_priority = $prio, ".
						"data = '$content' WHERE ispconfig_id = $ispconfig_id AND type != 'SOA'");
				} elseif ($type == 'SRV') {
					$app->db->query("UPDATE named.records SET zone = '$origin', ttl = $ttl, type = '$type', ".
						"data = '$prio $content' WHERE ispconfig_id = $ispconfig_id AND type != 'SOA'");
				} else {
					$app->db->query("UPDATE named.records SET zone = '$origin', ttl = $ttl, type = '$type', host = '$name', ".
						"data = '$content' WHERE ispconfig_id = $ispconfig_id AND type != 'SOA'");
				}

				//unset($_db);
			} else {
				$this->rr_insert($event_name, $data);
			}
		}
	}

	function rr_delete($event_name, $data) {
		global $app, $conf;

		//$_db = clone $app->db;
		//$_db->dbName = 'named';

		$app->db->query( "DELETE FROM named.dns_records WHERE type != 'SOA' AND zone = '".substr($data['old']['origin'], 0, -1)."'");
		//unset($_db);
	}

} // end class
?>
