/**
* JRadius - A RADIUS Server Java Adapter
* Copyright (C) 2004-2005 PicoPoint, B.V.
* Copyright (c) 2006 David Bird <david@coova.com>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package net.jradius.packet;
import java.io.IOException;
import java.nio.ByteBuffer;
import net.jradius.packet.attribute.RadiusAttribute;
import net.jradius.packet.attribute.VSAttribute;
import net.jradius.packet.attribute.value.AttributeValue;
/**
* The Diameter Attribute Formatter
* @author David Bird
*/
public class DiameterFormat extends Format
{
// Diameter AVP Format Support
/*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AVP Code |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |V M P r r r r r| AVP Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Vendor-ID (opt) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Data ...
* +-+-+-+-+-+-+-+-+
*/
private static final byte AVP_VENDOR = (byte) 0x80;
//private static final byte AVP_MANDITORY = (byte)0x40;
//private static final byte AVP_ENCRYPTION = (byte)0x20;
public void packAttribute(ByteBuffer buffer, RadiusAttribute a)
{
AttributeValue attributeValue = a.getValue();
int length = attributeValue.getLength();
int padding = ((length + 0x03) & ~(0x03)) - length;
packHeader(buffer, a);
attributeValue.getBytes(buffer);
while (padding-- > 0) putUnsignedByte(buffer, 0);
}
public void packHeader(ByteBuffer buffer, RadiusAttribute a)
{
if (a instanceof VSAttribute)
{
packHeader(buffer, (VSAttribute) a);
return;
}
AttributeValue attributeValue = a.getValue();
putUnsignedInt(buffer, a.getType());
putUnsignedByte(buffer, 0);
putUnsignedByte(buffer, 0); // part of the AVP Length!
putUnsignedShort(buffer, attributeValue.getLength() + 8);
}
public void packHeader(ByteBuffer buffer, VSAttribute a)
{
AttributeValue attributeValue = a.getValue();
putUnsignedInt(buffer, a.getVsaAttributeType());
putUnsignedByte(buffer, AVP_VENDOR);
putUnsignedByte(buffer, 0); // part of the AVP Length!
putUnsignedShort(buffer, attributeValue.getLength() + 12);
putUnsignedInt(buffer, a.getVendorId());
}
public void unpackAttributeHeader(ByteBuffer buffer, AttributeParseContext ctx) throws IOException
{
ctx.attributeType = (int) getUnsignedInt(buffer);
int flags = getUnsignedByte(buffer);
getUnsignedByte(buffer);
ctx.attributeLength = getUnsignedShort(buffer);
ctx.headerLength = 8;
if ((flags & AVP_VENDOR) > 0)
{
ctx.vendorNumber = (int)getUnsignedInt(buffer);
ctx.headerLength += 4;
}
ctx.padding = (int) (((ctx.attributeLength + 0x03) & ~(0x03)) - ctx.attributeLength);
}
}