| /* Extension.java -- A TLS hello extension. |
| 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; |
| import java.nio.ByteOrder; |
| |
| /** |
| * An SSL hello extension. |
| * |
| * <pre> |
| * struct { |
| * ExtensionType extension_type; |
| * opaque extension_data<0..2^16-1>; |
| * } Extension;</pre> |
| * |
| * @author csm@gnu.org |
| */ |
| public final class Extension implements Builder, Constructed |
| { |
| |
| // Fields. |
| // ------------------------------------------------------------------------- |
| |
| private ByteBuffer buffer; |
| |
| // Constructor. |
| // ------------------------------------------------------------------------- |
| |
| public Extension(final ByteBuffer buffer) |
| { |
| this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN); |
| } |
| |
| public Extension(final Type type, final Value value) |
| { |
| ByteBuffer valueBuffer = value.buffer(); |
| int length = 2 + 2 + valueBuffer.remaining(); |
| buffer = ByteBuffer.allocate(length); |
| buffer.putShort((short) type.getValue()); |
| buffer.putShort((short) valueBuffer.remaining()); |
| buffer.put(valueBuffer); |
| buffer.rewind(); |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------- |
| |
| public int length () |
| { |
| return (buffer.getShort (2) & 0xFFFF) + 4; |
| } |
| |
| public ByteBuffer buffer() |
| { |
| return (ByteBuffer) buffer.duplicate().limit(length()); |
| } |
| |
| public Type type() |
| { |
| return Type.forValue (buffer.getShort (0) & 0xFFFF); |
| } |
| |
| public byte[] valueBytes() |
| { |
| int len = buffer.getShort (2) & 0xFFFF; |
| byte[] value = new byte[len]; |
| ((ByteBuffer) buffer.duplicate ().position (4)).get (value); |
| return value; |
| } |
| |
| public ByteBuffer valueBuffer() |
| { |
| int len = buffer.getShort(2) & 0xFFFF; |
| return ((ByteBuffer) buffer.duplicate().position(4).limit(len+4)).slice(); |
| } |
| |
| public Value value() |
| { |
| switch (type ()) |
| { |
| case SERVER_NAME: |
| return new ServerNameList(valueBuffer()); |
| |
| case MAX_FRAGMENT_LENGTH: |
| switch (valueBuffer().get() & 0xFF) |
| { |
| case 1: return MaxFragmentLength.LEN_2_9; |
| case 2: return MaxFragmentLength.LEN_2_10; |
| case 3: return MaxFragmentLength.LEN_2_11; |
| case 4: return MaxFragmentLength.LEN_2_12; |
| default: |
| throw new IllegalArgumentException("invalid max_fragment_len"); |
| } |
| |
| case TRUNCATED_HMAC: |
| return new TruncatedHMAC(); |
| |
| case CLIENT_CERTIFICATE_URL: |
| return new CertificateURL(valueBuffer()); |
| |
| case TRUSTED_CA_KEYS: |
| return new TrustedAuthorities(valueBuffer()); |
| |
| case STATUS_REQUEST: |
| return new CertificateStatusRequest(valueBuffer()); |
| |
| case SRP: |
| case CERT_TYPE: |
| } |
| return new UnresolvedExtensionValue(valueBuffer()); |
| } |
| |
| public void setLength (final int newLength) |
| { |
| if (newLength < 0 || newLength > 65535) |
| throw new IllegalArgumentException ("length is out of bounds"); |
| buffer.putShort (2, (short) newLength); |
| } |
| |
| public void setType (final Type type) |
| { |
| buffer.putShort(0, (short) type.getValue()); |
| } |
| |
| public void setValue (byte[] value) |
| { |
| setValue (value, 0, value.length); |
| } |
| |
| public void setValue (final byte[] value, final int offset, final int length) |
| { |
| if (length != length ()) |
| throw new IllegalArgumentException ("length is different than claimed length"); |
| ((ByteBuffer) buffer.duplicate().position(4)).put(value, offset, length); |
| } |
| |
| public String toString() |
| { |
| return toString(null); |
| } |
| |
| public String toString(String prefix) |
| { |
| StringWriter str = new StringWriter(); |
| PrintWriter out = new PrintWriter(str); |
| if (prefix != null) out.print (prefix); |
| out.println("struct {"); |
| if (prefix != null) out.print (prefix); |
| out.println(" type = " + type () + ";"); |
| if (prefix != null) out.print (prefix); |
| String subprefix = " "; |
| if (prefix != null) subprefix = prefix + subprefix; |
| out.println(" value ="); |
| out.println(value().toString(subprefix)); |
| if (prefix != null) out.print (prefix); |
| out.print("} Extension;"); |
| return str.toString(); |
| } |
| |
| // Inner classes. |
| // ------------------------------------------------------------------------- |
| |
| public static enum Type |
| { |
| SERVER_NAME (0), |
| MAX_FRAGMENT_LENGTH (1), |
| CLIENT_CERTIFICATE_URL (2), |
| TRUSTED_CA_KEYS (3), |
| TRUNCATED_HMAC (4), |
| STATUS_REQUEST (5), |
| SRP (6), |
| CERT_TYPE (7); |
| |
| private final int value; |
| |
| private Type(int value) |
| { |
| this.value = value; |
| } |
| |
| public static Type forValue (final int value) |
| { |
| switch (value & 0xFFFF) |
| { |
| case 0: return SERVER_NAME; |
| case 1: return MAX_FRAGMENT_LENGTH; |
| case 2: return CLIENT_CERTIFICATE_URL; |
| case 3: return TRUSTED_CA_KEYS; |
| case 4: return TRUNCATED_HMAC; |
| case 5: return STATUS_REQUEST; |
| case 6: return SRP; |
| case 7: return CERT_TYPE; |
| default: return null; |
| } |
| } |
| |
| public int getValue() |
| { |
| return value; |
| } |
| } |
| |
| public static abstract class Value implements Builder, Constructed |
| { |
| } |
| } |