<?php
/********************************* PHP-P10 ******************************
 *    P10 uplink class by pk910   (c)2011 pk910                         *
 ************************************************************************
 *                          Version 2 (OOP)                             *
 *                                                                      *
 * PHP-P10 is free software; you can redistribute it and/or modify      *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation; either version 2 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with PHP-P10; if not, write to the Free Software Foundation,   *
 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.       *
 *                                                                      *
 ************************************************************************
 * 
 *  Uplink/Uplink.class.php
 *
 * This file contains the basic P10 Protocol handler.
 *
 ************************************************************************
 * accessable methods:
 *
 * void initialize()
 *     has to be called after the settings have been set.
 *
 * void loop() 
 *     loop function that should be calles as many times as possible. 
 *     It reads from the socket and BLOCKS the script execution for a 
 *     specific time if nothing is received.
 *
 * void setUplinkHost(String $host, int $port, bool $ssl = false, String $bind = null)
 *     sets the Uplink connection information.
 *
 * void setLoopTimeout(int $timeout)
 *     sets the maximum time loop() is blocking the script execution.
 *
 * void setUplinkServer(int $numeric, String $name, String $password, String $description)
 *     sets the own P10 Server information.
 *
 * void setValidateServer(String $name, String $password)
 *     sets additional security relevant information about the remote server.
 */
require_once("Client.class.php");
require_once("Numerics.class.php");
require_once("P10Formatter.class.php");

class Uplink {
	private $client = new Client();
	private $settings = array();
	private $server;
	
	const FLAG_P10SESSION      = 0x0001; //connection is in P10 mode (server is connected)
	const FLAG_SECURITY_QUIT   = 0x0002; //local connection abort because of security issues
	const FLAG_NOT_CONNECTABLE = 0x0004; //remote server is not connectable
	private $flags = 0;
	
	public function __construct() {
		$this->setSettings("recv_timeout", 1000);
	}
	
	public function initialize() {
		if($this->server) {
			trigger_error("Uplink already initialized.", E_USER_ERROR);
			return;
		}
		$self_numeric = $this->getSetting("numeric");
		$self_name = $this->getSetting("name");
		$self_description = $this->getSetting("description");
		if(!$self_numeric || !$self_name) {
			trigger_error("Server Settings missing.", E_USER_ERROR);
			return;
		}
		$this->server = new P10_Server($self_name, $self_numeric, null, time(), time(), $self_description);
	}
	
	public function loop() {
		if($this->server == null) {
			trigger_error("Uplink not initialized.", E_USER_ERROR);
			return;
		}
		if(!$this->client->connected()) {
			if(($this->flags & self::FLAG_P10SESSION)) {
				//Server got disconnected
				$this->server->disconnectServer(true);
				$this->flags &= ~self::FLAG_P10SESSION;
			}
			$host = $this->getSetting("host");
			$port = $this->getSetting("port");
			if($host == null || $port == null) {
				trigger_error("Uplink Settings missing.", E_USER_ERROR);
				return;
			}
			if(($this->flags & self::FLAG_SECURITY_QUIT) || ($this->flags & self::FLAG_NOT_CONNECTABLE)) {
				sleep(1);
			}
			$state = $this->client->connect($host, $port, $this->getSettings("bind"), $this->getSettings("ssl"), $this->getSettings("recv_timeout"));
			if(!$state) {
				usleep($this->getSetting("recv_timeout") / 1000);
				$this->flags |= self::FLAG_NOT_CONNECTABLE;
				return;
			}
			$this->flags = 0;
			$this->loginServer();
		}
		//try to receive new data from the Uplink
		$lines = $this->client->recv();
		if($lines == null) return;
		foreach($lines as $line) {
			$this->parseLine($line);
		}
	}
	
	public function setUplink($host, $port, $ssl = false, $bind = null) {
		$this->setSetting("host", $host);
		$this->setSetting("port", $port);
		$this->setSetting("ssl", $ssl);
		$this->setSetting("bind", $bind);
	}
	
	public function setLoopTimeout($timeout) {
		$this->setSetting("recv_timeout", $timeout);
	}
	
	public function setUplinkServer($numeric, $name, $password, $description) {
		$this->setSetting("numeric", Numerics::intToNum($numeric, 2));
		$this->setSetting("name", $name);
		$this->setSetting("password", $password);
		$this->setSetting("description", $description);
	}
	
	public function setValidateServer($name, $password) {
		$this->setSetting("their_name", $name);
		$this->setSetting("their_password", $password);
	}
	
	private function setSetting($setting, $value) {
		$this->settings[$setting] = $value;
	}
	
	private function getSetting($setting) {
		if(array_key_exists($setting, $this->settings)) {
			return $this->settings[$setting];
		} else {
			return null;
		}
	}
	
	private function loginServer() {
		$password = $this->getSetting("password");
		$this->send("PASS", $password);
		$this->send("SERVER", $this->server->getName(), $this->server->getStartTime(), $this->server->getLinkTime(), $this->server->getNumeric(), $this->server->getDescription());
	}
	
	private function parseLine($line) {
		$highExplode = explode(" :", $line, 2);
		$tokens = explode(" ", $highExplode[0]);
		if(count($highExplode) > 1)
			$tokens[] = $highExplode[1];
		$cmdPos = (($this->flags & self::FLAG_P10SESSION) ? 1 : 0);
		if($cmdPos == 1) $from = $tokens[0];
		else $from = null;
		$arguments = array_slice($tokens, $cmdPos + 1);
		switch(strtoupper($tokens[$cmdPos])) {
		//pre P10 Session
			case "PASS":
				$this->recv_pass($from, $arguments);
				break;
			case "SERVER":
				$this->recv_server($from, $arguments);
				break;
			case "ERROR":
				$this->recv_error($from, $arguments);
				break;
		//P10 Session
			default:
				//unknown cmd
				break;
		}
	}
	
	private function send($command) {
		if(func_num_args() > 1) {
			$args = array_slice(func_get_args(), 1);
			$command = P10Formatter::formatCMD($this->getSetting("numeric"), $command, $args);
		}
		$this->client->send($command);
	}
	
	/********************************************************************************************
	 *                                     INCOMING COMMANDS                                    *
	 ********************************************************************************************/
	
	private function recv_pass($from, $args) {
		$their_pass = $this->getSetting("their_password");
		if($their_pass) {
			if($args[0] != $their_pass) {
				//security QUIT
				$this->flags |= self::FLAG_SECURITY_QUIT;
				$this->send("ERROR", "Incorrect password received.");
				$this->client->disconnect();
			}
		}
	}
	
	private function recv_error($from, $args) {
		//we received an error - the socket is dead for us, now
		//maybe we want to log this, later
		$this->client->disconnect();
	}
	
	private function recv_server($from, $args) {
		if($from == null) {
			//our uplink Server
			$their_name = $this->getSetting("their_name");
			if($their_name && $args[0] != $their_name) {
				$this->flags |= self::FLAG_SECURITY_QUIT;
				$this->send("ERROR", "Invalid Server name");
				$this->client->disconnect();
				return;
			}
			$new_server = new P10_Server($args[0], substr($args[5],0,2), $this->server, $args[2], $args[3], $args[7]);
			$this->server->add_server($new_server);
			$this->flags |= self::FLAG_P10SESSION;
		} else {
			//another server got a new slave server ^^
			$server = P10_Server::getServerByNum($from);
			if($server == null) {
				trigger_error("Parent Server (".$from.") does not exist or was not found on recv_server.", E_USER_ERROR);
				return;
			}
			$new_server = new P10_Server($args[0], substr($args[5],0,2), $server, $args[2], $args[3], $args[7]);
			$server->add_server($new_server);
		}
	}
	
}

?>