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/* |
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* i-scream central monitoring system |
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* http://www.i-scream.org.uk |
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* Copyright (C) 2000-2002 i-scream |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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*/ |
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|
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//---PACKAGE DECLARATION--- |
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package uk.org.iscream.cms.server.filter.plugins; |
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|
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//---IMPORTS--- |
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import uk.org.iscream.cms.server.filter.PluginFilter; |
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import uk.org.iscream.cms.server.filter.*; |
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import uk.org.iscream.cms.server.core.*; |
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import uk.org.iscream.cms.util.*; |
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import uk.org.iscream.cms.server.componentmanager.*; |
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|
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/** |
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* This plugin is designed to check the source of incoming |
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* packets, and ensure the source machine is permitted to |
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* send packets through the system. |
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* |
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* @author $Author: tdb $ |
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* @version $Id: SourceChecker__Plugin.java,v 1.4 2002/05/21 16:47:18 tdb Exp $ |
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*/ |
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public class SourceChecker__Plugin implements PluginFilter { |
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|
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//---FINAL ATTRIBUTES--- |
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|
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/** |
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* The current CVS revision of this class |
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*/ |
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public final String REVISION = "$Revision: 1.4 $"; |
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|
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public final String DESC = "Checks the machine_name attribute in the packet attributes. This must machine must be permitted by the ACL to allow the packet through."; |
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|
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//---STATIC METHODS--- |
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|
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//---CONSTRUCTORS--- |
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|
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public SourceChecker__Plugin() { |
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// setup an empty ACL defaulting to ALLOW |
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_acl = new ACL(ACL.ALLOW); |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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// apply the filter and return true if successful. |
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public boolean runFilter(XMLPacket packet){ |
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String newStringACL; |
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// get hold of the ACL in the configuration |
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try { |
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newStringACL = ConfigurationProxy.getInstance().getProperty("Filter." + FilterMain.NAME, "Filter.SourceCheckerPluginACL"); |
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} |
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catch(PropertyNotFoundException e) { |
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// if we can't find it, we'll just use a null ACL |
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newStringACL = ""; |
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_logger.write(toString(), Logger.WARNING, "No ACL found for SourceChecker__Plugin, using empty ACL instead : " + e); |
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} |
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// check to see if the ACL has changed |
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if(!newStringACL.equals(_stringACL)) { |
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_logger.write(toString(), Logger.SYSMSG, "Reloading Access Control List"); |
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// clear the ACL |
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_acl.clear(); |
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// set the default to something sane |
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_acl.setDefaultMode(ACL.ALLOW); |
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// add the new ACL (this may change the default) |
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_acl.add(newStringACL); |
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_stringACL = newStringACL; |
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} |
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|
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// only want to check data or heartbeat packets |
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// any others will probably get filtered out further up the filter chain |
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if(packet.getParam("packet.attributes.type").equals("data") || |
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packet.getParam("packet.attributes.type").equals("heartbeat")) { |
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// check the machine name against the ACL |
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// we could check the IP too... but it's a lot of work for _every_ packet... maybe... |
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return _acl.check(packet.getParam("packet.attributes.machine_name")); |
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} |
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|
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// a good catchall, I guess |
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// it's not a data or heartbeat packet, in which case it should go through |
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return true; |
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} |
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|
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* This uses the uk.org.iscream.cms.util.NameFormat class |
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* to format the toString() |
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* |
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* @return the name of this class and its CVS revision |
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*/ |
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public String toString() { |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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|
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/** |
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* return the String representation of what the filter does |
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*/ |
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public String getDescription(){ |
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return DESC; |
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} |
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|
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//---PRIVATE METHODS--- |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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//---ATTRIBUTES--- |
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|
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/** |
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* This is the friendly identifier of the |
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* component this class is running in. |
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* eg, a Filter may be called "filter1", |
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* If this class does not have an owning |
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* component, a name from the configuration |
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* can be placed here. This name could also |
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* be changed to null for utility classes. |
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*/ |
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private String _name = FilterMain.NAME; |
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|
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/** |
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* This holds a reference to the |
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* system logger that is being used. |
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*/ |
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private Logger _logger = ReferenceManager.getInstance().getLogger(); |
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|
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/** |
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* This holds the ACL for the plugin. |
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*/ |
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private ACL _acl; |
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|
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/** |
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* The current String representation of our ACL. |
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*/ |
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private String _stringACL = ""; |
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|
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//---STATIC ATTRIBUTES--- |
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|
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} |
