sun.security.ssl.ALPNExtension Maven / Gradle / Ivy
/*
* Copyright (c) 2014, Mort Bay Consulting Pty. Ltd. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Mort Bay Consulting designates this
* particular file as subject to the "Classpath" exception as provided
* by Mort Bay Consulting in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*/
package sun.security.ssl;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import javax.net.ssl.SSLProtocolException;
public class ALPNExtension extends HelloExtension
{
private static final int ID = ExtensionType.EXT_ALPN.id;
private final List protocols = new ArrayList<>();
private final byte[] content;
public ALPNExtension(List protocols) throws SSLProtocolException
{
super(ExtensionType.get(ID));
this.protocols.addAll(protocols);
content = init();
}
public ALPNExtension(HandshakeInStream input, int length) throws IOException
{
super(ExtensionType.get(ID));
length = input.getInt16();
while (length > 0)
{
byte[] protocolBytes = input.getBytes8();
protocols.add(new String(protocolBytes, "UTF-8"));
length -= 1 + protocolBytes.length;
}
content = init();
}
private byte[] init() throws SSLProtocolException
{
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
for (String protocol : protocols)
{
byte[] protocolBytes = protocol.getBytes(Charset.forName("UTF-8"));
int length = protocolBytes.length;
if (length > 255)
throw new SSLProtocolException("Protocol name too long: " + protocol);
bytes.write(length);
bytes.write(protocolBytes, 0, length);
}
byte[] protocolsBytes = bytes.toByteArray();
byte[] result = new byte[2 + protocolsBytes.length];
result[0] = (byte)((protocolsBytes.length & 0xFF00) >> 8);
result[1] = (byte)(protocolsBytes.length & 0xFF);
System.arraycopy(protocolsBytes, 0, result, 2, protocolsBytes.length);
return result;
}
public List getProtocols()
{
return protocols;
}
@Override
int length()
{
return 2 + 2 + content.length;
}
@Override
void send(HandshakeOutStream out) throws IOException
{
out.putInt16(ID);
out.putInt16(content.length);
out.write(content, 0, content.length);
}
@Override
public String toString()
{
return "Extension " + type + ", protocols: " + protocols;
}
}