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File://usr/local/lsws/add-ons/snmp_monitoring/class.litespeed_snmp_bridge.php

<?php

/*----------------------------------------
LiteSpeed_Stats to SNMP bridge. Relay stats to SNMPD.

Copyright (C) 2006 LiteSpeed Technologies, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Version: 1.0 @ 08/23/2006
Contact: bug@litespeedtech.com
Url: http://www.litespeedtech.com

Requirement:

1)LiteSpeed Web Server version >= 2.1.18
2)PHP 5+

----------------------------------------*/

require_once("class.litespeed_stats.php");


class litespeed_snmp_bridge {
	public $processes = 1;
	public $report_path = "/tmp/lshttpd/";
	public $cache_time = 0;
	public $cache_file = null;

	public $stats = null;

	public function litespeed_snmp_bridge($processes = 1, $report_path = "/tmp/lshttpd/", $cache_time = 0, $cache_file = null) {
		$this->processes = (int) $processes;
		$this->report_path = trim($report_path);

		//prepare parser
		if($this->cache_time > 0 && strlen($this->cache_file) > 0) {
			if(file_exists($this->cache_file) && time() - filemtime($this->cache_file) <= $this->cache_time) {
				$unserial = unserialize(file_get_contents($this->cache_file));

				if(is_a($unserial,"litespeed_stats")) {
					$this->stats = $unserial;
				}
				else {
					$this->stats = new litespeed_stats($this->processes,$this->report_path);
					$this->stats->parse();
					$this->save_cache($this->cache_file, $this->stats);
				}
			}
			else {
				$this->stats = new litespeed_stats($this->processes,$this->report_path);
				$this->stats->parse();
				$this->save_cache($this->cache_file, $this->stats);
			}
		}
		else {
			$this->stats = new litespeed_stats($this->processes,$this->report_path);
			$this->stats->parse();
		}
	}

	//generate snmp compatible response
	public function format_response($oid, $type, $data) {
		return "{$oid}\n{$type}\n{$data}\n";
	}

	//aggregate oid info from 1 to 7 sector
	public function oid_part($tarray = null) {
		$str = "";
		for($i=1; $i <= 7; $i++) {
			$str .= "." . $tarray[$i];
		}

		return $str;
	}

	//retrieve single oid data
	public function oid_get($super, $oid) {


		$parsed = explode(".",$oid);

		//error..invalid oid parse
		if(count($parsed) < 9) {
			return;
		}

		$major = (int) $parsed[8];

		if(count($parsed) < 10) {
			$minor = 1;
		}
		else {
			$minor =  (int) $parsed[9];
		}

		foreach($super as $key => $value) {
			$sanitized_major = (int) substr($major,0,1) . "00";

			//index only
			if( $major == (int) $key ) {
				return $this->format_response($this->oid_part($parsed) . "." . $major . "." . $minor,"integer",$minor);

			}

			//non-index value
			if( $sanitized_major == (int) $key) {
				$size = count($value[0]);

				$map = $value[1];

				if($size <= 0) {
					return null;
				}

				if(count($parsed) == 10) {

					if($minor > 0 && $minor <= $size) {
						$tempkeys = array_keys($value[0]);
						$temp = $value[0][$tempkeys[$minor-1]];
						list($format,$itemkey) = explode(",",$value[1][$major]);
						return $this->format_response($oid, $format, $temp->$itemkey);
					}
				}
			}
		}
	}


	public function save_cache($file, $data) {
		file_put_contents($file, serialize($data));
	}


	public function process($type, $oid) {

		//setup oid to var maps
		$vh_map = array(
		"201" => "string,vhost",
		"202" => "gauge,req_processing",
		"203" => "gauge,req_per_sec",
		"204" => "counter,req_total"
		);

		$ext_map = array(
		"301" => "string,vhost",
		"302" => "string,type",
		"303" => "string,extapp",
		"304" => "gauge,config_max_conn",
		"305" => "gauge,effect_max_conn",
		"306" => "gauge,pool_size",
		"307" => "gauge,inuse_conn",
		"308" => "gauge,idle_conn",
		"309" => "gauge,waitqueue_depth",
		"310" => "gauge,req_per_sec",
		"311" => "counter,req_total"
		);

		$gen_map = array(
		"101" => "string,product",
		"102" => "string,edition",
		"103" => "string,version",
		"104" => "string,uptime",
		"105" => "gauge,bps_in",
		"106" => "gauge,bps_out",
		"107" => "gauge,ssl_bps_in",
		"108" => "gauge,ssl_bps_out",
		"109" => "gauge,max_conn",
		"110" => "gauge,max_ssl_conn",
		"111" => "gauge,plain_conn",
		"112" => "gauge,avail_conn",
		"113" => "gauge,idle_conn",
		"114" => "gauge,ssl_conn",
		"115" => "gauge,avail_ssl_conn"
		);


		//setup pointers
		$super = array();
		$super["100"] = array(array($this->stats), $gen_map);
		$super["200"] = array($this->stats->vhosts, $vh_map);

		//put alll extapps to single array
		$extapps = array();
		foreach($this->stats->vhosts as $value) {
			foreach($value->extapps as $vextapp) {
				$extapps[] = $vextapp;
			}
		}

		$super["300"] = array($extapps, $ext_map);

		//get single method
		if($type == "-g") {
			echo $this->oid_get($super, $oid);
			return;
		}

		//snmp walk traversal
		else if($type == "-n") {
			//build traversal nodes/oids
			$parsed = explode(".",$oid);
			$major = $parsed[8];


			foreach($super as $key => $value) {

				//form index walk
				if($major == $key) {
					$size = count($value[0]);

					if($size <= 0) {
						return;
					}

					if(count($parsed) == 10) {
						$minor = (int) $parsed[9];

						if($minor > 0 && $minor < $size) {
							echo $this->format_response($this->oid_part($parsed).".{$key}.".($minor+1),"integer",$minor+1);

						}
					}
					else if(count($parsed) == 9){
						echo $this->format_response("{$oid}.1","integer",1);
					}

				}

				//data walk
				else if(array_key_exists($major,$value[1])) {
					$size = count($value[0]);

					if($size <= 0) {
						return;
					}

					if(count($parsed) == 10) {
						$minor = (int) $parsed[9];

						if($minor > 0 && $minor < $size) {
							echo $this->oid_get($super, $this->oid_part($parsed).".{$major}.".($minor+1));


						}
					}
					else if(count($parsed) == 9){
						echo $this->oid_get($super, $this->oid_part($parsed).".{$major}.".(1));
					}

				}
			}
		}
	}

}

?>

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