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| 1 | /* | ||
| 2 | * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.security.ssl; | ||
| 27 | |||
| 28 | import java.util.*; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * A list of ProtocolVersions. Also maintains the list of supported protocols. | ||
| 32 | * Instances of this class are immutable. Some member variables are final | ||
| 33 | * and can be accessed directly without method accessors. | ||
| 34 | * | ||
| 35 | * @author Andreas Sterbenz | ||
| 36 | * @since 1.4.1 | ||
| 37 | */ | ||
| 38 | final class ProtocolList { | ||
| 39 | |||
| 40 | // the sorted protocol version list | ||
| 41 | private final ArrayList<ProtocolVersion> protocols; | ||
| 42 | |||
| 43 | private String[] protocolNames; | ||
| 44 | |||
| 45 | // the minimum and maximum ProtocolVersions in this list | ||
| 46 | final ProtocolVersion min, max; | ||
| 47 | |||
| 48 | // the format for the hello version to use | ||
| 49 | final ProtocolVersion helloVersion; | ||
| 50 | |||
| 51 | ProtocolList(String[] names) { | ||
| 52 | this(convert(names)); | ||
| 53 | } | ||
| 54 | |||
| 55 | ProtocolList(ArrayList<ProtocolVersion> versions) { | ||
| 56 | this.protocols = versions; | ||
| 57 | |||
| 58 | if ((protocols.size() == 1) && | ||
| 59 | protocols.contains(ProtocolVersion.SSL20Hello)) { | ||
| 60 | throw new IllegalArgumentException("SSLv2Hello cannot be " + | ||
| 61 | "enabled unless at least one other supported version " + | ||
| 62 | "is also enabled."); | ||
| 63 | } | ||
| 64 | |||
| 65 | if (protocols.size() != 0) { | ||
| 66 | Collections.sort(protocols); | ||
| 67 | min = protocols.get(0); | ||
| 68 | max = protocols.get(protocols.size() - 1); | ||
| 69 | helloVersion = protocols.get(0); | ||
| 70 | } else { | ||
| 71 | min = ProtocolVersion.NONE; | ||
| 72 | max = ProtocolVersion.NONE; | ||
| 73 | helloVersion = ProtocolVersion.NONE; | ||
| 74 | } | ||
| 75 | } | ||
| 76 | |||
| 77 | private static ArrayList<ProtocolVersion> convert(String[] names) { | ||
| 78 | if (names == null) { | ||
| 79 | throw new IllegalArgumentException("Protocols may not be null"); | ||
| 80 | } | ||
| 81 | |||
| 82 | ArrayList<ProtocolVersion> versions = new ArrayList<>(3); | ||
| 83 | for (int i = 0; i < names.length; i++ ) { | ||
| 84 | ProtocolVersion version = ProtocolVersion.valueOf(names[i]); | ||
| 85 | if (versions.contains(version) == false) { | ||
| 86 | versions.add(version); | ||
| 87 | } | ||
| 88 | } | ||
| 89 | |||
| 90 | return versions; | ||
| 91 | } | ||
| 92 | |||
| 93 | /** | ||
| 94 | * Return whether this list contains the specified protocol version. | ||
| 95 | * SSLv2Hello is not a real protocol version we support, we always | ||
| 96 | * return false for it. | ||
| 97 | */ | ||
| 98 | boolean contains(ProtocolVersion protocolVersion) { | ||
| 99 | if (protocolVersion == ProtocolVersion.SSL20Hello) { | ||
| 100 | return false; | ||
| 101 | } | ||
| 102 | return protocols.contains(protocolVersion); | ||
| 103 | } | ||
| 104 | |||
| 105 | /** | ||
| 106 | * Return a reference to the internal Collection of CipherSuites. | ||
| 107 | * The Collection MUST NOT be modified. | ||
| 108 | */ | ||
| 109 | Collection<ProtocolVersion> collection() { | ||
| 110 | return protocols; | ||
| 111 | } | ||
| 112 | |||
| 113 | /** | ||
| 114 | * Select a protocol version from the list. | ||
| 115 | * | ||
| 116 | * Return the lower of the protocol version of that suggested by | ||
| 117 | * the <code>protocolVersion</code> and the highest version of this | ||
| 118 | * protocol list, or null if no protocol version is available. | ||
| 119 | * | ||
| 120 | * The method is used by TLS server to negotiated the protocol | ||
| 121 | * version between client suggested protocol version in the | ||
| 122 | * client hello and protocol versions supported by the server. | ||
| 123 | */ | ||
| 124 | ProtocolVersion selectProtocolVersion(ProtocolVersion protocolVersion) { | ||
| 125 | ProtocolVersion selectedVersion = null; | ||
| 126 | for (ProtocolVersion pv : protocols) { | ||
| 127 | if (pv.v > protocolVersion.v) { | ||
| 128 | break; // Safe to break here as this.protocols is sorted | ||
| 129 | } | ||
| 130 | selectedVersion = pv; | ||
| 131 | } | ||
| 132 | |||
| 133 | return selectedVersion; | ||
| 134 | } | ||
| 135 | |||
| 136 | /** | ||
| 137 | * Return an array with the names of the ProtocolVersions in this list. | ||
| 138 | */ | ||
| 139 | synchronized String[] toStringArray() { | ||
| 140 | if (protocolNames == null) { | ||
| 141 | protocolNames = new String[protocols.size()]; | ||
| 142 | int i = 0; | ||
| 143 | for (ProtocolVersion version : protocols) { | ||
| 144 | protocolNames[i++] = version.name; | ||
| 145 | } | ||
| 146 | } | ||
| 147 | return protocolNames.clone(); | ||
| 148 | } | ||
| 149 | |||
| 150 | public String toString() { | ||
| 151 | return protocols.toString(); | ||
| 152 | } | ||
| 153 | } | ||