git.ipfire.org Git - thirdparty/strongswan.git/blob

   1 /*
   2  * Copyright (C) 2013 Tobias Brunner
   3  * Copyright (C) 2012 Christoph Buehler
   4  * Copyright (C) 2012 Patrick Loetscher
   5  * Hochschule fuer Technik Rapperswil
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  */
  17
  18 package org.strongswan.android.logic.imc.attributes;
  19
  20 import java.util.LinkedList;
  21
  22 import org.strongswan.android.logic.imc.collectors.Protocol;
  23 import org.strongswan.android.utils.BufferedByteWriter;
  24
  25 import android.util.Pair;
  26
  27 /**
  28  * PA-TNC Port Filter attribute (see section 4.2.6 of RFC 5792)
  29  *
  30  *                       1                   2                   3
  31  *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  32  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  33  *  |   Reserved  |B|    Protocol   |         Port Number           |
  34  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  35  *  |   Reserved  |B|    Protocol   |         Port Number           |
  36  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  37  */
  38 public class PortFilterAttribute implements Attribute
  39 {
  40         private final LinkedList<Pair<Protocol, Short>> mPorts = new LinkedList<Pair<Protocol, Short>>();
  41
  42         /**
  43          * Add an open port with the given protocol and port number
  44          * @param protocol transport protocol
  45          * @param port port number
  46          */
  47         public void addPort(Protocol protocol, short port)
  48         {
  49                 mPorts.add(new Pair<Protocol, Short>(protocol, port));
  50         }
  51
  52         @Override
  53         public byte[] getEncoding()
  54         {
  55                 BufferedByteWriter writer = new BufferedByteWriter();
  56                 for (Pair<Protocol, Short> port : mPorts)
  57                 {
  58                         /* we report open ports, so the BLOCKED flag is not set */
  59                         writer.put((byte)0);
  60                         writer.put(port.first.getValue());
  61                         writer.put16(port.second);
  62                 }
  63                 return writer.toByteArray();
  64         }
  65 }