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jeremybenn |
/* ServerHello.java -- SSL ServerHello message.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.net.ssl.provider;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.nio.ByteBuffer;
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/**
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* The server hello message.
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*
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* <pre>
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struct
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{
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ProtocolVersion server_version;
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Random random;
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SessionID session_id;
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CipherSuite cipher_suite;
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CompressionMethod compression_method;
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Extensions server_hello_extension_list<0..2^16-1>
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} ServerHello;
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</pre>
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*
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* <p>Server hello messages may contain extra data after the
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* <tt>compression_method</tt> field, which are interpreted as
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* extensions to the basic handshake.
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*/
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public class ServerHello implements Handshake.Body
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{
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// Fields.
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// -------------------------------------------------------------------------
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protected static final int RANDOM_OFFSET = 2;
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protected static final int SESSID_OFFSET = 32 + RANDOM_OFFSET;
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protected static final int SESSID_OFFSET2 = SESSID_OFFSET + 1;
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protected ByteBuffer buffer;
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protected boolean disableExtensions;
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// Constructor.
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// -------------------------------------------------------------------------
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public ServerHello (final ByteBuffer buffer)
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{
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this.buffer = buffer;
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disableExtensions = false;
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}
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public int length ()
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{
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int sessionLen = buffer.get(SESSID_OFFSET) & 0xFF;
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int len = SESSID_OFFSET2 + sessionLen + 3;
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int elen = 0;
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if (!disableExtensions && len + 1 < buffer.limit()
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&& (elen = buffer.getShort(len)) != 0)
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len += 2 + elen;
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return len;
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}
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/**
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* Returns the server's protocol version. This will read two bytes
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* from the beginning of the underlying buffer, and return an
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* instance of the appropriate {@link ProtocolVersion}; if the
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* version read is a supported version, this method returns a static
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* constant instance.
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*
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* @return The server's protocol version.
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*/
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public ProtocolVersion version()
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{
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return ProtocolVersion.getInstance (buffer.getShort (0));
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}
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/**
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* Returns the server's random value. This method returns a
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* lightwieght wrapper around the existing bytes; modifications to
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* the underlying buffer will modify the returned object, and
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* vice-versa.
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*
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* @return The server's random value.
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*/
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public Random random()
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{
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ByteBuffer randomBuf =
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((ByteBuffer) buffer.duplicate ().position (RANDOM_OFFSET)
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.limit (SESSID_OFFSET)).slice ();
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return new Random (randomBuf);
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}
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/**
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* Returns the session ID. This method returns a new byte array with
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* the session ID bytes.
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*
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* @return The session ID.
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*/
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public byte[] sessionId()
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{
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int idlen = buffer.get (SESSID_OFFSET) & 0xFF;
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byte[] sessionId = new byte[idlen];
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buffer.position (SESSID_OFFSET2);
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buffer.get (sessionId);
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return sessionId;
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}
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/**
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* Returns the server's chosen cipher suite. The returned cipher
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* suite will be "resolved" to this structure's version.
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*
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* @return The server's chosen cipher suite.
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*/
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public CipherSuite cipherSuite()
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{
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int offset = SESSID_OFFSET2 + (buffer.get(SESSID_OFFSET) & 0xFF);
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return CipherSuite.forValue(buffer.getShort(offset)).resolve();
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}
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/**
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* Returns the server's chosen compression method.
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*
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* @return The chosen compression method.
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*/
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public CompressionMethod compressionMethod()
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{
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int offset = SESSID_OFFSET2 + (buffer.get(SESSID_OFFSET) & 0xFF) + 2;
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return CompressionMethod.getInstance(buffer.get(offset) & 0xFF);
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}
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public int extensionsLength()
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{
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int offset = SESSID_OFFSET2 + (buffer.get (SESSID_OFFSET) & 0xFF) + 3;
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if (offset + 1 >= buffer.limit())
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return 0;
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return buffer.getShort(offset) & 0xFFFF;
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}
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public ExtensionList extensions ()
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{
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int offset = SESSID_OFFSET2 + (buffer.get (SESSID_OFFSET) & 0xFF) + 3;
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if (offset + 1 >= buffer.limit())
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return null;
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int len = buffer.getShort(offset) & 0xFFFF;
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if (len == 0)
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len = buffer.limit() - offset - 2;
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ByteBuffer ebuf = ((ByteBuffer) buffer.duplicate().position(offset)
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.limit(offset + len + 2)).slice();
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return new ExtensionList(ebuf);
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}
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public String toString()
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{
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return toString(null);
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}
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public String toString (final String prefix)
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{
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StringWriter str = new StringWriter();
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PrintWriter out = new PrintWriter(str);
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if (prefix != null)
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out.print (prefix);
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out.println ("struct {");
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String subprefix = " ";
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if (prefix != null)
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subprefix += prefix;
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out.print (subprefix);
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out.print ("version: ");
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out.print (version ());
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out.println (";");
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out.print (subprefix);
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out.println ("random:");
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out.println (random ().toString (subprefix));
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out.print (subprefix);
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out.print ("sessionId: ");
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out.print (Util.toHexString(sessionId (), ':'));
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out.println (";");
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out.print (subprefix);
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out.print ("cipherSuite: ");
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out.print (cipherSuite ());
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out.println (";");
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out.print (subprefix);
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out.print ("compressionMethod: ");
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out.print (compressionMethod ());
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out.println (";");
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ExtensionList exts = extensions ();
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out.print (subprefix);
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out.println ("extensions:");
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out.println (exts != null ? exts.toString (subprefix+" ")
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: subprefix + " (nil)");
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if (prefix != null)
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out.print (prefix);
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out.print ("} ServerHello;");
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return str.toString();
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}
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}
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