| // |
| // ======================================================================== |
| // 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.fcgi.parser; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.fcgi.FCGI; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| /** |
| * <p>Parser for FastCGI frame headers.</p> |
| * <pre> |
| * struct frame_header { |
| * ubyte version; |
| * ubyte type; |
| * ushort requestId; |
| * ushort contentLength; |
| * ubyte paddingLength; |
| * ubyte reserved; |
| * } |
| * </pre> |
| * |
| * @see Parser |
| */ |
| public class HeaderParser |
| { |
| private static final Logger LOG = Log.getLogger(Parser.class); |
| |
| private State state = State.VERSION; |
| private int cursor; |
| private int version; |
| private int type; |
| private int request; |
| private int length; |
| private int padding; |
| |
| /** |
| * Parses the bytes in the given {@code buffer} as FastCGI header bytes |
| * |
| * @param buffer the bytes to parse |
| * @return whether there were enough bytes for a FastCGI header |
| */ |
| public boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case VERSION: |
| { |
| version = buffer.get() & 0xFF; |
| state = State.TYPE; |
| break; |
| } |
| case TYPE: |
| { |
| type = buffer.get() & 0xFF; |
| state = State.REQUEST; |
| break; |
| } |
| case REQUEST: |
| { |
| if (buffer.remaining() >= 2) |
| { |
| request = buffer.getShort() & 0xFF_FF; |
| state = State.LENGTH; |
| } |
| else |
| { |
| state = State.REQUEST_BYTES; |
| cursor = 0; |
| } |
| break; |
| } |
| case REQUEST_BYTES: |
| { |
| int halfShort = buffer.get() & 0xFF; |
| request = (request << 8) + halfShort; |
| if (++cursor == 2) |
| state = State.LENGTH; |
| break; |
| } |
| case LENGTH: |
| { |
| if (buffer.remaining() >= 2) |
| { |
| length = buffer.getShort() & 0xFF_FF; |
| state = State.PADDING; |
| } |
| else |
| { |
| state = State.LENGTH_BYTES; |
| cursor = 0; |
| } |
| break; |
| } |
| case LENGTH_BYTES: |
| { |
| int halfShort = buffer.get() & 0xFF; |
| length = (length << 8) + halfShort; |
| if (++cursor == 2) |
| state = State.PADDING; |
| break; |
| } |
| case PADDING: |
| { |
| padding = buffer.get() & 0xFF; |
| state = State.RESERVED; |
| break; |
| } |
| case RESERVED: |
| { |
| buffer.get(); |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Parsed request {} header {} length={}", getRequest(), getFrameType(), getContentLength()); |
| return true; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| public FCGI.FrameType getFrameType() |
| { |
| return FCGI.FrameType.from(type); |
| } |
| |
| public int getRequest() |
| { |
| return request; |
| } |
| |
| public int getContentLength() |
| { |
| return length; |
| } |
| |
| public int getPaddingLength() |
| { |
| return padding; |
| } |
| |
| protected void reset() |
| { |
| state = State.VERSION; |
| cursor = 0; |
| version = 0; |
| type = 0; |
| request = 0; |
| length = 0; |
| padding = 0; |
| } |
| |
| private enum State |
| { |
| VERSION, TYPE, REQUEST, REQUEST_BYTES, LENGTH, LENGTH_BYTES, PADDING, RESERVED |
| } |
| } |