| /* ServerHello.java -- SSL ServerHello message. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.net.ssl.provider; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * The server hello message. |
| * |
| * <pre> |
| struct |
| { |
| ProtocolVersion server_version; |
| Random random; |
| SessionID session_id; |
| CipherSuite cipher_suite; |
| CompressionMethod compression_method; |
| Extensions server_hello_extension_list<0..2^16-1> |
| } ServerHello; |
| </pre> |
| * |
| * <p>Server hello messages may contain extra data after the |
| * <tt>compression_method</tt> field, which are interpreted as |
| * extensions to the basic handshake. |
| */ |
| public class ServerHello implements Handshake.Body |
| { |
| |
| // Fields. |
| // ------------------------------------------------------------------------- |
| |
| protected static final int RANDOM_OFFSET = 2; |
| protected static final int SESSID_OFFSET = 32 + RANDOM_OFFSET; |
| protected static final int SESSID_OFFSET2 = SESSID_OFFSET + 1; |
| |
| protected ByteBuffer buffer; |
| protected boolean disableExtensions; |
| |
| // Constructor. |
| // ------------------------------------------------------------------------- |
| |
| public ServerHello (final ByteBuffer buffer) |
| { |
| this.buffer = buffer; |
| disableExtensions = false; |
| } |
| |
| public int length () |
| { |
| int sessionLen = buffer.get(SESSID_OFFSET) & 0xFF; |
| int len = SESSID_OFFSET2 + sessionLen + 3; |
| int elen = 0; |
| if (!disableExtensions && len + 1 < buffer.limit() |
| && (elen = buffer.getShort(len)) != 0) |
| len += 2 + elen; |
| return len; |
| } |
| |
| /** |
| * Returns the server's protocol version. This will read two bytes |
| * from the beginning of the underlying buffer, and return an |
| * instance of the appropriate {@link ProtocolVersion}; if the |
| * version read is a supported version, this method returns a static |
| * constant instance. |
| * |
| * @return The server's protocol version. |
| */ |
| public ProtocolVersion version() |
| { |
| return ProtocolVersion.getInstance (buffer.getShort (0)); |
| } |
| |
| /** |
| * Returns the server's random value. This method returns a |
| * lightwieght wrapper around the existing bytes; modifications to |
| * the underlying buffer will modify the returned object, and |
| * vice-versa. |
| * |
| * @return The server's random value. |
| */ |
| public Random random() |
| { |
| ByteBuffer randomBuf = |
| ((ByteBuffer) buffer.duplicate ().position (RANDOM_OFFSET) |
| .limit (SESSID_OFFSET)).slice (); |
| return new Random (randomBuf); |
| } |
| |
| /** |
| * Returns the session ID. This method returns a new byte array with |
| * the session ID bytes. |
| * |
| * @return The session ID. |
| */ |
| public byte[] sessionId() |
| { |
| int idlen = buffer.get (SESSID_OFFSET) & 0xFF; |
| byte[] sessionId = new byte[idlen]; |
| buffer.position (SESSID_OFFSET2); |
| buffer.get (sessionId); |
| return sessionId; |
| } |
| |
| /** |
| * Returns the server's chosen cipher suite. The returned cipher |
| * suite will be "resolved" to this structure's version. |
| * |
| * @return The server's chosen cipher suite. |
| */ |
| public CipherSuite cipherSuite() |
| { |
| int offset = SESSID_OFFSET2 + (buffer.get(SESSID_OFFSET) & 0xFF); |
| return CipherSuite.forValue(buffer.getShort(offset)).resolve(); |
| } |
| |
| /** |
| * Returns the server's chosen compression method. |
| * |
| * @return The chosen compression method. |
| */ |
| public CompressionMethod compressionMethod() |
| { |
| int offset = SESSID_OFFSET2 + (buffer.get(SESSID_OFFSET) & 0xFF) + 2; |
| return CompressionMethod.getInstance(buffer.get(offset) & 0xFF); |
| } |
| |
| public int extensionsLength() |
| { |
| int offset = SESSID_OFFSET2 + (buffer.get (SESSID_OFFSET) & 0xFF) + 3; |
| if (offset + 1 >= buffer.limit()) |
| return 0; |
| return buffer.getShort(offset) & 0xFFFF; |
| } |
| |
| public ExtensionList extensions () |
| { |
| int offset = SESSID_OFFSET2 + (buffer.get (SESSID_OFFSET) & 0xFF) + 3; |
| if (offset + 1 >= buffer.limit()) |
| return null; |
| int len = buffer.getShort(offset) & 0xFFFF; |
| if (len == 0) |
| len = buffer.limit() - offset - 2; |
| ByteBuffer ebuf = ((ByteBuffer) buffer.duplicate().position(offset) |
| .limit(offset + len + 2)).slice(); |
| return new ExtensionList(ebuf); |
| } |
| |
| public String toString() |
| { |
| return toString(null); |
| } |
| |
| public String toString (final String prefix) |
| { |
| StringWriter str = new StringWriter(); |
| PrintWriter out = new PrintWriter(str); |
| if (prefix != null) |
| out.print (prefix); |
| out.println ("struct {"); |
| String subprefix = " "; |
| if (prefix != null) |
| subprefix += prefix; |
| out.print (subprefix); |
| out.print ("version: "); |
| out.print (version ()); |
| out.println (";"); |
| out.print (subprefix); |
| out.println ("random:"); |
| out.println (random ().toString (subprefix)); |
| out.print (subprefix); |
| out.print ("sessionId: "); |
| out.print (Util.toHexString(sessionId (), ':')); |
| out.println (";"); |
| out.print (subprefix); |
| out.print ("cipherSuite: "); |
| out.print (cipherSuite ()); |
| out.println (";"); |
| out.print (subprefix); |
| out.print ("compressionMethod: "); |
| out.print (compressionMethod ()); |
| out.println (";"); |
| ExtensionList exts = extensions (); |
| out.print (subprefix); |
| out.println ("extensions:"); |
| out.println (exts != null ? exts.toString (subprefix+" ") |
| : subprefix + " (nil)"); |
| if (prefix != null) |
| out.print (prefix); |
| out.print ("} ServerHello;"); |
| return str.toString(); |
| } |
| } |