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jeremybenn |
/* ClientHelloV2.java -- a hello message from SSLv2.
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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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import java.nio.ByteOrder;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* A client hello message from SSLv2. In SSLv3 and later, clients can
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* send an SSLv2 client hello message, but set the protocol version
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* for a later version.
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*
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* <p>The format of a version 2 client hello is:
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*
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* <pre>
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char MSG-CLIENT-HELLO // equals 1
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char CLIENT-VERSION-MSB
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char CLIENT-VERSION-LSB
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char CIPHER-SPECS-LENGTH-MSB
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char CIPHER-SPECS-LENGTH-LSB
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char SESSION-ID-LENGTH-MSB
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char SESSION-ID-LENGTH-LSB
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char CHALLENGE-LENGTH-MSB
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char CHALLENGE-LENGTH-LSB
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char CIPHER-SPECS-DATA[(MSB<<8)|LSB]
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char SESSION-ID-DATA[(MSB<<8)|LSB]
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char CHALLENGE-DATA[(MSB<<8)|LSB]</pre>
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*/
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class ClientHelloV2 implements Constructed
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{
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private final ByteBuffer buffer;
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ClientHelloV2 (final ByteBuffer buffer)
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{
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this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
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}
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public int length ()
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{
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return 9 + cipherSpecsLength () + sessionIdLength () + challengeLength ();
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}
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ProtocolVersion version ()
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{
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return ProtocolVersion.getInstance (buffer.getShort (1));
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}
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int cipherSpecsLength ()
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{
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return buffer.getShort (3) & 0xFFFF;
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}
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int sessionIdLength ()
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{
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return buffer.getShort (5) & 0xFFFF;
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}
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int challengeLength ()
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{
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return buffer.getShort (7) & 0xFFFF;
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}
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public List<CipherSuite> cipherSpecs ()
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{
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int n = cipherSpecsLength ();
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List<CipherSuite> l = new ArrayList<CipherSuite>(n / 3);
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ByteBuffer b = (ByteBuffer) buffer.duplicate ().position (9);
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for (int i = 0; i < n; i += 3)
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{
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if (b.get () == 0)
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l.add (CipherSuite.forValue(b.getShort()).resolve());
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else
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b.getShort ();
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}
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return l;
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}
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byte[] sessionId ()
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{
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byte[] id = new byte[sessionIdLength ()];
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((ByteBuffer) buffer.duplicate ().position (9 + cipherSpecsLength ())).get (id);
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return id;
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}
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byte[] challenge ()
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{
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byte[] challenge = new byte[challengeLength ()];
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((ByteBuffer) buffer.duplicate ().position (9 + cipherSpecsLength () + sessionIdLength ())).get (challenge);
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return challenge;
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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 (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) out.print (prefix);
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out.println ("CLIENT-HELLO-MSG");
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if (prefix != null) out.print (prefix);
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out.print (" version: ");
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out.println (version ());
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if (prefix != null) out.print (prefix);
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out.println (" suites: ");
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out.println (cipherSpecs ());
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if (prefix != null) out.print (prefix);
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out.print (" sessionId: ");
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out.println (Util.toHexString (sessionId (), ':'));
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if (prefix != null) out.print (prefix);
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out.print (" challenge: ");
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out.println (Util.toHexString (challenge (), ':'));
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return str.toString ();
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}
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}
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