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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package libcore.tlswire.handshake;
     17 
     18 import java.io.ByteArrayInputStream;
     19 import java.io.DataInput;
     20 import java.io.DataInputStream;
     21 import java.io.EOFException;
     22 import java.io.IOException;
     23 import java.math.BigInteger;
     24 import java.util.ArrayList;
     25 import java.util.List;
     26 import libcore.tlswire.util.IoUtils;
     27 import libcore.tlswire.util.TlsProtocolVersion;
     28 
     29 /**
     30  * {@link ClientHello} {@link HandshakeMessage} from TLS 1.2 RFC 5246.
     31  */
     32 public class ClientHello extends HandshakeMessage {
     33     public TlsProtocolVersion clientVersion;
     34     public byte[] random;
     35     public byte[] sessionId;
     36     public List<CipherSuite> cipherSuites;
     37     public List<CompressionMethod> compressionMethods;
     38     /** Extensions or {@code null} for no extensions. */
     39     public List<HelloExtension> extensions;
     40     @Override
     41     protected void parseBody(DataInput in) throws IOException {
     42         clientVersion = TlsProtocolVersion.read(in);
     43         random = new byte[32];
     44         in.readFully(random);
     45         sessionId = IoUtils.readTlsVariableLengthByteVector(in, 32);
     46         int[] cipherSuiteCodes = IoUtils.readTlsVariableLengthUnsignedShortVector(in, 0xfffe);
     47         cipherSuites = new ArrayList<CipherSuite>(cipherSuiteCodes.length);
     48         for (int i = 0; i < cipherSuiteCodes.length; i++) {
     49             cipherSuites.add(CipherSuite.valueOf(cipherSuiteCodes[i]));
     50         }
     51         byte[] compressionMethodCodes = IoUtils.readTlsVariableLengthByteVector(in, 0xff);
     52         compressionMethods = new ArrayList<CompressionMethod>(compressionMethodCodes.length);
     53         for (int i = 0; i < compressionMethodCodes.length; i++) {
     54             int code = compressionMethodCodes[i] & 0xff;
     55             compressionMethods.add(CompressionMethod.valueOf(code));
     56         }
     57         int extensionsSectionSize;
     58         try {
     59             extensionsSectionSize = in.readUnsignedShort();
     60         } catch (EOFException e) {
     61             // No extensions present
     62             extensionsSectionSize = 0;
     63         }
     64         if (extensionsSectionSize > 0) {
     65             extensions = new ArrayList<HelloExtension>();
     66             byte[] extensionsBytes = new byte[extensionsSectionSize];
     67             in.readFully(extensionsBytes);
     68             ByteArrayInputStream extensionsIn = new ByteArrayInputStream(extensionsBytes);
     69             DataInput extensionsDataIn = new DataInputStream(extensionsIn);
     70             while (extensionsIn.available() > 0) {
     71                 try {
     72                     extensions.add(HelloExtension.read(extensionsDataIn));
     73                 } catch (IOException e) {
     74                     throw new IOException(
     75                             "Failed to read HelloExtension #" + (extensions.size() + 1));
     76                 }
     77             }
     78         }
     79     }
     80     public HelloExtension findExtensionByType(int extensionType) {
     81         if (extensions == null) {
     82             return null;
     83         }
     84         for (HelloExtension extension : extensions) {
     85             if (extension.type == extensionType) {
     86                 return extension;
     87             }
     88         }
     89         return null;
     90     }
     91     @Override
     92     public String toString() {
     93         return "ClientHello{client version: " + clientVersion + ", random: "
     94                 + new BigInteger(1, random).toString(16) + ", sessionId: "
     95                 + new BigInteger(1, sessionId).toString(16) + ", cipher suites: " + cipherSuites
     96                 + ", compression methods: " + compressionMethods
     97                 + ((extensions != null) ? (", extensions: " + String.valueOf(extensions)) : "")
     98                 + "}";
     99     }
    100 }
    101