| /* |
| * Copyright (c) 2002, 2012, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.ssl; |
| |
| import java.util.*; |
| |
| /** |
| * A list of ProtocolVersions. Also maintains the list of supported protocols. |
| * Instances of this class are immutable. Some member variables are final |
| * and can be accessed directly without method accessors. |
| * |
| * @author Andreas Sterbenz |
| * @since 1.4.1 |
| */ |
| final class ProtocolList { |
| |
| // the sorted protocol version list |
| private final ArrayList<ProtocolVersion> protocols; |
| |
| private String[] protocolNames; |
| |
| // the minimum and maximum ProtocolVersions in this list |
| final ProtocolVersion min, max; |
| |
| // the format for the hello version to use |
| final ProtocolVersion helloVersion; |
| |
| ProtocolList(String[] names) { |
| this(convert(names)); |
| } |
| |
| ProtocolList(ArrayList<ProtocolVersion> versions) { |
| this.protocols = versions; |
| |
| if ((protocols.size() == 1) && |
| protocols.contains(ProtocolVersion.SSL20Hello)) { |
| throw new IllegalArgumentException("SSLv2Hello cannot be " + |
| "enabled unless at least one other supported version " + |
| "is also enabled."); |
| } |
| |
| if (protocols.size() != 0) { |
| Collections.sort(protocols); |
| min = protocols.get(0); |
| max = protocols.get(protocols.size() - 1); |
| helloVersion = protocols.get(0); |
| } else { |
| min = ProtocolVersion.NONE; |
| max = ProtocolVersion.NONE; |
| helloVersion = ProtocolVersion.NONE; |
| } |
| } |
| |
| private static ArrayList<ProtocolVersion> convert(String[] names) { |
| if (names == null) { |
| throw new IllegalArgumentException("Protocols may not be null"); |
| } |
| |
| ArrayList<ProtocolVersion> versions = new ArrayList<>(names.length); |
| for (int i = 0; i < names.length; i++ ) { |
| ProtocolVersion version = ProtocolVersion.valueOf(names[i]); |
| if (versions.contains(version) == false) { |
| versions.add(version); |
| } |
| } |
| |
| return versions; |
| } |
| |
| /** |
| * Return whether this list contains the specified protocol version. |
| * SSLv2Hello is not a real protocol version we support, we always |
| * return false for it. |
| */ |
| boolean contains(ProtocolVersion protocolVersion) { |
| if (protocolVersion == ProtocolVersion.SSL20Hello) { |
| return false; |
| } |
| return protocols.contains(protocolVersion); |
| } |
| |
| /** |
| * Return a reference to the internal Collection of CipherSuites. |
| * The Collection MUST NOT be modified. |
| */ |
| Collection<ProtocolVersion> collection() { |
| return protocols; |
| } |
| |
| /** |
| * Select a protocol version from the list. |
| * |
| * Return the lower of the protocol version of that suggested by |
| * the <code>protocolVersion</code> and the highest version of this |
| * protocol list, or null if no protocol version is available. |
| * |
| * The method is used by TLS server to negotiated the protocol |
| * version between client suggested protocol version in the |
| * client hello and protocol versions supported by the server. |
| */ |
| ProtocolVersion selectProtocolVersion(ProtocolVersion protocolVersion) { |
| ProtocolVersion selectedVersion = null; |
| for (ProtocolVersion pv : protocols) { |
| if (pv.v > protocolVersion.v) { |
| break; // Safe to break here as this.protocols is sorted |
| } |
| selectedVersion = pv; |
| } |
| |
| return selectedVersion; |
| } |
| |
| /** |
| * Return an array with the names of the ProtocolVersions in this list. |
| */ |
| synchronized String[] toStringArray() { |
| if (protocolNames == null) { |
| protocolNames = new String[protocols.size()]; |
| int i = 0; |
| for (ProtocolVersion version : protocols) { |
| protocolNames[i++] = version.name; |
| } |
| } |
| return protocolNames.clone(); |
| } |
| |
| @Override |
| public String toString() { |
| return protocols.toString(); |
| } |
| } |