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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 | +} | |