/* SocketPermission.java -- Class modeling permissions for socket operations   Copyright (C) 1998, 2000, 2001, 2002 Free Software Foundation, Inc.This file is part of GNU Classpath.GNU Classpath is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2, or (at your option)any later version.GNU Classpath is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU Classpath; see the file COPYING.  If not, write to theFree Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307 USA.Linking this library statically or dynamically with other modules ismaking a combined work based on this library.  Thus, the terms andconditions of the GNU General Public License cover the wholecombination.As a special exception, the copyright holders of this library give youpermission to link this library with independent modules to produce anexecutable, regardless of the license terms of these independentmodules, and to copy and distribute the resulting executable underterms of your choice, provided that you also meet, for each linkedindependent module, the terms and conditions of the license of thatmodule.  An independent module is a module which is not derived fromor based on this library.  If you modify this library, you may extendthis exception to your version of the library, but you are notobligated to do so.  If you do not wish to do so, delete thisexception statement from your version. */package java.net;import java.io.Serializable;import java.security.Permission;import java.security.PermissionCollection;/** * This class models a specific set of permssions for connecting to a * host.  There are two elements to this, the host/port combination and * the permission list. * <p> * The host/port combination is specified as followed * <p> * <pre> * hostname[:[-]port[-[port]]] * </pre> * <p> * The hostname portion can be either a hostname or IP address.  If it is * a hostname, a wildcard is allowed in hostnames.  This wildcard is a "*" * and matches one or more characters.  Only one "*" may appear in the * host and it must be the leftmost character.  For example, * "*.urbanophile.com" matches all hosts in the "urbanophile.com" domain. * <p> * The port portion can be either a single value, or a range of values * treated as inclusive.  The first or the last port value in the range * can be omitted in which case either the minimum or maximum legal * value for a port (respectively) is used by default.  Here are some * examples: * <p><ul> * <li>8080 - Represents port 8080 only * <li>2000-3000 - Represents ports 2000 through 3000 inclusive * <li>-4000 - Represents ports 0 through 4000 inclusive * <li>1024- - Represents ports 1024 through 65535 inclusive * </ul><p> * The permission list is a comma separated list of individual permissions. * These individual permissions are: * <p> * accept<br> * connect<br> * listen<br> * resolve<br> * <p> * The "listen" permission is only relevant if the host is localhost.  If * any permission at all is specified, then resolve permission is implied to * exist. * <p> * Here are a variety of examples of how to create SocketPermission's * <p><pre> * SocketPermission("www.urbanophile.com", "connect"); *   Can connect to any port on www.urbanophile.com * SocketPermission("www.urbanophile.com:80", "connect,accept"); *   Can connect to or accept connections from www.urbanophile.com on port 80 * SocketPermission("localhost:1024-", "listen,accept,connect"); *   Can connect to, accept from, an listen on any local port number 1024 *   and up. * SocketPermission("*.edu", "connect"); *   Can connect to any host in the edu domain * SocketPermission("197.197.20.1", "accept"); *   Can accept connections from 197.197.20.1 * </pre><p> * * @since 1.2 * * @author Aaron M. Renn (arenn@urbanophile.com) */public final class SocketPermission extends Permission  implements Serializable{  static final long serialVersionUID = -7204263841984476862L;// FIXME: Needs serialization work, including readObject/writeObject methods.  /**   * A hostname/port combination as described above   */  private transient String hostport;  /**   * A comma separated list of actions for which we have permission   */  private String actions;  /**   * Initializes a new instance of <code>SocketPermission</code> with the    * specified host/port combination and actions string.   *   * @param hostport The hostname/port number combination   * @param actions The actions string   */  public SocketPermission(String hostport, String actions)  {    super(hostport);    this.hostport = hostport;    this.actions = actions;  }  /**   * Tests this object for equality against another.  This will be true if   * and only if the passed object is an instance of    * <code>SocketPermission</code> and both its hostname/port combination    * and permissions string are identical.   *   * @param obj The object to test against for equality   *   * @return <code>true</code> if object is equal to this object,    *         <code>false</code> otherwise.   */  public boolean equals(Object obj)  {    if (obj == null)      return (false);    if (!(obj instanceof SocketPermission))      return (false);    if (((SocketPermission) obj).hostport.equals(hostport))      if (((SocketPermission) obj).actions.equals(actions))	return (true);    return (false);  }  /**   * Returns a hash code value for this object.  Overrides the    * Permission.hashCode()   *   * @return A hash code   */  public int hashCode()  {    int hash = 100;    if (hostport != null)      hash += hostport.hashCode();    if (actions != null)      hash += actions.hashCode();    return hash;  }  /**   * Returns the list of permission actions in this object in canonical   * order.  The canonical order is "connect,listen,accept,resolve"   *   * @return The permitted action string.   */  public String getActions()  {    boolean found = false;    StringBuffer sb = new StringBuffer("");    if (actions.indexOf("connect") != -1)      {	sb.append("connect");	found = true;      }    if (actions.indexOf("listen") != -1)      if (found)	  sb.append(",listen");      else	{	  sb.append("listen");	  found = true;	}    if (actions.indexOf("accept") != -1)      if (found)	sb.append(",accept");      else	{	  sb.append("accept");	  found = true;	}    if (found)      sb.append(",resolve");    else if (actions.indexOf("resolve") != -1)      sb.append("resolve");    return (sb.toString());  }  /**   * Returns a new <code>PermissionCollection</code> object that can hold   * <code>SocketPermission</code>'s.   *   * @return A new <code>PermissionCollection</code>.   */  public PermissionCollection newPermissionCollection()  {    // FIXME: Implement    return (null);  }  /**   * Returns true if the permission object passed it is implied by the   * this permission.  This will be true if    * <p><ul>   * <li>The argument is of type SocketPermission   * <li>The actions list of the argument are in this object's actions   * <li>The port range of the argument is within this objects port range   * <li>The hostname is equal to or a subset of this objects hostname   * </ul>   * <p>   * The argument's hostname will be a subset of this object's hostname if:   * <p><ul>   * <li>The argument's hostname or IP address is equal to this object's.   * <li>The argument's canonical hostname is equal to this object's.   * <li>The argument's canonical name matches this domains hostname with   * wildcards   * </ul>   *   * @param perm The Permission to check against   *   * @return <code>true</code> if the <code>Permission</code> is implied by    * this object, <code>false</code> otherwise.   */  public boolean implies(Permission perm)  {    SocketPermission p;    // First make sure we are the right object type    if (perm instanceof SocketPermission)      p = (SocketPermission) perm;    else      return (false);    // Next check the actions    String ourlist = getActions();    String theirlist = p.getActions();    if (!ourlist.startsWith(theirlist))      return (false);    // Now check ports    int ourfirstport = 0, ourlastport = 0, theirfirstport = 0, theirlastport =      0;    // Get ours    if (hostport.indexOf(":") == -1)      {        ourfirstport = 0;        ourlastport = 65535;      }    else      {        // FIXME:  Needs bulletproofing.        // This will dump if hostport if all sorts of bad data was passed to        // the constructor        String range = hostport.substring(hostport.indexOf(":") + 1);        if (range.startsWith("-"))          ourfirstport = 0;        else if (range.indexOf("-") == -1)          ourfirstport = Integer.parseInt(range);        else          ourfirstport =            Integer.parseInt(range.substring(0, range.indexOf("-")));        if (range.endsWith("-"))          ourlastport = 65535;        else if (range.indexOf("-") == -1)          ourlastport = Integer.parseInt(range);        else          ourlastport =            Integer.parseInt(range.                             substring(range.indexOf("-") + 1,                                       range.length()));      }    // Get theirs    if (p.hostport.indexOf(":") == -1)      {        theirfirstport = 0;        ourlastport = 65535;      }    else      {        // This will dump if hostport if all sorts of bad data was passed to        // the constructor        String range = p.hostport.substring(hostport.indexOf(":") + 1);        if (range.startsWith("-"))          theirfirstport = 0;        else if (range.indexOf("-") == -1)          theirfirstport = Integer.parseInt(range);        else          theirfirstport =            Integer.parseInt(range.substring(0, range.indexOf("-")));        if (range.endsWith("-"))          theirlastport = 65535;        else if (range.indexOf("-") == -1)          theirlastport = Integer.parseInt(range);        else          theirlastport =            Integer.parseInt(range.                             substring(range.indexOf("-") + 1,                                       range.length()));      }    // Now check them    if ((theirfirstport < ourfirstport) || (theirlastport > ourlastport))      return (false);    // Finally we can check the hosts    String ourhost, theirhost;    // Get ours    if (hostport.indexOf(":") == -1)      ourhost = hostport;    else      ourhost = hostport.substring(0, hostport.indexOf(":"));    // Get theirs    if (p.hostport.indexOf(":") == -1)      theirhost = p.hostport;    else      theirhost = p.hostport.substring(0, p.hostport.indexOf(":"));    // Are they equal?    if (ourhost.equals(theirhost))      return (true);    // Try the canonical names    String ourcanonical = null, theircanonical = null;    try      {        ourcanonical = InetAddress.getByName(ourhost).getHostName();        theircanonical = InetAddress.getByName(theirhost).getHostName();      }    catch (UnknownHostException e)      {        // Who didn't resolve?  Just assume current address is canonical enough        // Is this ok to do?        if (ourcanonical == null)          ourcanonical = ourhost;        if (theircanonical == null)          theircanonical = theirhost;      }    if (ourcanonical.equals(theircanonical))      return (true);    // Well, last chance.  Try for a wildcard    if (ourhost.indexOf("*.") != -1)      {        String wild_domain = ourhost.substring(ourhost.indexOf("*" + 1));        if (theircanonical.endsWith(wild_domain))          return (true);      }    // Didn't make it    return (false);  }}