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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/javax/net/ssl/provider/ServerHello.java
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+/* 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&lt;0..2^16-1&gt;
+} 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();
+ }
+}