| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.http2.parser; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.http2.ErrorCode; |
| import org.eclipse.jetty.http2.frames.GoAwayFrame; |
| |
| public class GoAwayBodyParser extends BodyParser |
| { |
| private State state = State.PREPARE; |
| private int cursor; |
| private int length; |
| private int lastStreamId; |
| private int error; |
| private byte[] payload; |
| |
| public GoAwayBodyParser(HeaderParser headerParser, Parser.Listener listener) |
| { |
| super(headerParser, listener); |
| } |
| |
| private void reset() |
| { |
| state = State.PREPARE; |
| cursor = 0; |
| length = 0; |
| lastStreamId = 0; |
| error = 0; |
| payload = null; |
| } |
| |
| @Override |
| public boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case PREPARE: |
| { |
| state = State.LAST_STREAM_ID; |
| length = getBodyLength(); |
| break; |
| } |
| case LAST_STREAM_ID: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| lastStreamId = buffer.getInt(); |
| lastStreamId &= 0x7F_FF_FF_FF; |
| state = State.ERROR; |
| length -= 4; |
| if (length <= 0) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_go_away_frame"); |
| } |
| else |
| { |
| state = State.LAST_STREAM_ID_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case LAST_STREAM_ID_BYTES: |
| { |
| int currByte = buffer.get() & 0xFF; |
| --cursor; |
| lastStreamId += currByte << (8 * cursor); |
| --length; |
| if (cursor > 0 && length <= 0) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_go_away_frame"); |
| if (cursor == 0) |
| { |
| lastStreamId &= 0x7F_FF_FF_FF; |
| state = State.ERROR; |
| if (length == 0) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_go_away_frame"); |
| } |
| break; |
| } |
| case ERROR: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| error = buffer.getInt(); |
| state = State.PAYLOAD; |
| length -= 4; |
| if (length < 0) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_go_away_frame"); |
| if (length == 0) |
| return onGoAway(lastStreamId, error, null); |
| } |
| else |
| { |
| state = State.ERROR_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case ERROR_BYTES: |
| { |
| int currByte = buffer.get() & 0xFF; |
| --cursor; |
| error += currByte << (8 * cursor); |
| --length; |
| if (cursor > 0 && length <= 0) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_go_away_frame"); |
| if (cursor == 0) |
| { |
| state = State.PAYLOAD; |
| if (length == 0) |
| return onGoAway(lastStreamId, error, null); |
| } |
| break; |
| } |
| case PAYLOAD: |
| { |
| payload = new byte[length]; |
| if (buffer.remaining() >= length) |
| { |
| buffer.get(payload); |
| return onGoAway(lastStreamId, error, payload); |
| } |
| else |
| { |
| state = State.PAYLOAD_BYTES; |
| cursor = length; |
| } |
| break; |
| } |
| case PAYLOAD_BYTES: |
| { |
| payload[payload.length - cursor] = buffer.get(); |
| --cursor; |
| if (cursor == 0) |
| return onGoAway(lastStreamId, error, payload); |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| private boolean onGoAway(int lastStreamId, int error, byte[] payload) |
| { |
| GoAwayFrame frame = new GoAwayFrame(lastStreamId, error, payload); |
| reset(); |
| notifyGoAway(frame); |
| return true; |
| } |
| |
| private enum State |
| { |
| PREPARE, LAST_STREAM_ID, LAST_STREAM_ID_BYTES, ERROR, ERROR_BYTES, PAYLOAD, PAYLOAD_BYTES |
| } |
| } |