/*

 * 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.io.*;

import java.nio.*;

import javax.crypto.BadPaddingException;

import javax.net.ssl.*;

/**

 * {@code InputRecord} implementation for {@code SSLEngine}.

 */

final class SSLEngineInputRecord extends InputRecord implements SSLRecord {

    // used by handshake hash computation for handshake fragment

    private byte prevType = -1;

    private int hsMsgOff = 0;

    private int hsMsgLen = 0;

    private boolean formatVerified = false;     // SSLv2 ruled out?

    }

    @Override

    int estimateFragmentSize(int packetSize) {

        if (packetSize > 0) {

        } else {

            return Record.maxDataSize;

        }

    }

    @Override

        /*

         * SSLv2 length field is in bytes 0/1

         * SSLv3/TLS length field is in bytes 3/4

         */

        if (packet.remaining() < 5) {

            return -1;

        }

        int pos = packet.position();

        byte byteZero = packet.get(pos);

        int len = 0;

        /*

         * If we have already verified previous packets, we can

         * ignore the verifications steps, and jump right to the

         * determination.  Otherwise, try one last hueristic to

         * see if it's SSL/TLS.

         */

        if (formatVerified ||

            /*

             * Last sanity check that it's not a wild record

             */

            /*

             * Reasonably sure this is a V3, disable further checks.

             * We can't do the same in the v2 check below, because

             * read still needs to parse/handle the v2 clientHello.

             */

            formatVerified = true;

            /*

             * One of the SSLv3/TLS message types.

             */

            len = ((packet.get(pos + 3) & 0xFF) << 8) +

                   (packet.get(pos + 4) & 0xFF) + headerSize;

        } else {

            /*

             * Must be SSLv2 or something unknown.

             * Check if it's short (2 bytes) or

             * long (3) header.

             *

             * Internals can warn about unsupported SSLv2

             */

            boolean isShort = ((byteZero & 0x80) != 0);

            if (isShort &&

                    ((packet.get(pos + 2) == 1) || packet.get(pos + 2) == 4)) {

                /*

                 * Client or Server Hello

                 */

                int mask = (isShort ? 0x7F : 0x3F);

                len = ((byteZero & mask) << 8) +

                        (packet.get(pos + 1) & 0xFF) + (isShort ? 2 : 3);

            } else {

                // Gobblygook!

                throw new SSLException(

                        "Unrecognized SSL message, plaintext connection?");

            }

        }

        return len;

    }

    @Override

        }

    }

            throws IOException, BadPaddingException {

        if (isClosed) {

            return null;

        }

        }

        // The caller should have validated the record.

        if (!formatVerified) {

            formatVerified = true;

            /*

             * The first record must either be a handshake record or an

             * alert message. If it's not, it is either invalid or an

             * SSLv2 message.

             */

            int pos = packet.position();

            byte byteZero = packet.get(pos);

                return handleUnknownRecord(packet);

            }

        }

        return decodeInputRecord(packet);

    }

            throws IOException, BadPaddingException {

        //

        // The packet should be a complete record, or more.

        //

        int srcPos = packet.position();

        int srcLim = packet.limit();

        byte contentType = packet.get();                   // pos: 0

        byte majorVersion = packet.get();                  // pos: 1

        byte minorVersion = packet.get();                  // pos: 2

                    contentLen);

        }

        //

        // Check for upper bound.

        //

        // Note: May check packetSize limit in the future.

        if (contentLen < 0 || contentLen > maxLargeRecordSize - headerSize) {

            throw new SSLProtocolException(

                "Bad input record size, TLSCiphertext.length = " + contentLen);

        }

        //

        // check for handshake fragment

        //

            throw new SSLProtocolException(

                    "Expected to get a handshake fragment");

        }

        //

        // Decrypt the fragment

        //

        int recLim = srcPos + SSLRecord.headerSize + contentLen;

        packet.limit(recLim);

        packet.position(srcPos + SSLRecord.headerSize);

        try {

        } finally {

            // comsume a complete record

            packet.limit(srcLim);

            packet.position(recLim);

        }

        //

        //

                }

                } else {

                    }

                }

            }

        }

    }

            throws IOException, BadPaddingException {

        //

        // The packet should be a complete record.

        //

        int srcPos = packet.position();

        int srcLim = packet.limit();

        byte firstByte = packet.get(srcPos);

        byte thirdByte = packet.get(srcPos + 2);

        // Does it look like a Version 2 client hello (V2ClientHello)?

        if (((firstByte & 0x80) != 0) && (thirdByte == 1)) {

            /*

             * If SSLv2Hello is not enabled, throw an exception.

             */

            if (helloVersion != ProtocolVersion.SSL20Hello) {

                throw new SSLHandshakeException("SSLv2Hello is not enabled");

            }

            byte majorVersion = packet.get(srcPos + 3);

            byte minorVersion = packet.get(srcPos + 4);

            if ((majorVersion == ProtocolVersion.SSL20Hello.major) &&

                (minorVersion == ProtocolVersion.SSL20Hello.minor)) {

                /*

                 * Looks like a V2 client hello, but not one saying

                 * "let's talk SSLv3".  So we need to send an SSLv2

                 * error message, one that's treated as fatal by

                 * clients (Otherwise we'll hang.)

                 */

                            "Requested to negotiate unsupported SSLv2!");

                }

                // hack code, the exception is caught in SSLEngineImpl

                // so that SSLv2 error message can be delivered properly.

                throw new UnsupportedOperationException(        // SSLv2Hello

                        "Unsupported SSL v2.0 ClientHello");

            }

            /*

             * If we can map this into a V3 ClientHello, read and

             * hash the rest of the V2 handshake, turn it into a

             * V3 ClientHello message, and pass it up.

             */

            packet.position(srcPos + 2);        // exclude the header

            packet.position(srcPos);

            ByteBuffer converted = convertToClientHello(packet);

                        "[Converted] ClientHello", converted);

            }

        } else {

            if (((firstByte & 0x80) != 0) && (thirdByte == 4)) {

                throw new SSLException("SSL V2.0 servers are not supported.");

            }

            throw new SSLException("Unsupported or unrecognized SSL message");

        }

    }

}