| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.aries.rsa.provider.fastbin.tcp; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.net.ProtocolException; |
| import java.net.SocketException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.ReadableByteChannel; |
| import java.nio.channels.SocketChannel; |
| import java.nio.channels.WritableByteChannel; |
| import java.util.LinkedList; |
| import java.util.Queue; |
| |
| import org.apache.aries.rsa.provider.fastbin.io.ProtocolCodec; |
| import org.fusesource.hawtbuf.Buffer; |
| |
| public class LengthPrefixedCodec implements ProtocolCodec { |
| |
| /** prevent DOS attacks in case a very large size field is sent. Default is 10MB */ |
| private static final int MAX_PACKET_SIZE = Integer.getInteger("aries.fastbin.max.packet.bytes", 1024 * 1024 * 10) <= 0 ? Integer.MAX_VALUE : Integer.getInteger("aries.fastbin.max.packet.bytes", 1024 * 1024 * 10); |
| |
| final int write_buffer_size = 1024 * 64; |
| long write_counter = 0L; |
| WritableByteChannel write_channel; |
| final Queue<ByteBuffer> next_write_buffers = new LinkedList<>(); |
| int next_write_size = 0; |
| |
| public boolean full() { |
| return false; |
| } |
| |
| protected boolean empty() { |
| if (next_write_size > 0) { |
| return false; |
| } |
| if (!next_write_buffers.isEmpty()) { |
| for (ByteBuffer b : next_write_buffers) { |
| if (b.remaining() > 0) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| public void setWritableByteChannel(WritableByteChannel channel) { |
| this.write_channel = channel; |
| if (channel instanceof SocketChannel) { |
| try { |
| ((SocketChannel) channel).socket().setSendBufferSize(write_buffer_size); |
| } catch (SocketException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| |
| public BufferState write(Object value) throws IOException { |
| if (full()) { |
| return BufferState.FULL; |
| } else { |
| boolean wasEmpty = empty(); |
| Buffer buffer = (Buffer) value; |
| next_write_size += buffer.length; |
| next_write_buffers.add(buffer.toByteBuffer()); |
| return wasEmpty ? BufferState.WAS_EMPTY : BufferState.NOT_EMPTY; |
| } |
| } |
| |
| public BufferState flush() throws IOException { |
| final long writeCounterBeforeFlush = write_counter; |
| while(!next_write_buffers.isEmpty()) { |
| final ByteBuffer nextBuffer = next_write_buffers.peek(); |
| if (nextBuffer.remaining() < 1) { |
| next_write_buffers.remove(); |
| continue; |
| } |
| int bytesWritten = write_channel.write(nextBuffer); |
| write_counter += bytesWritten; |
| next_write_size -= bytesWritten; |
| if (nextBuffer.remaining() > 0) { |
| break; |
| } |
| } |
| if (empty()) { |
| if (writeCounterBeforeFlush == write_counter) { |
| return BufferState.WAS_EMPTY; |
| } else { |
| return BufferState.EMPTY; |
| } |
| } |
| return BufferState.NOT_EMPTY; |
| } |
| |
| public long getWriteCounter() { |
| return write_counter; |
| } |
| |
| long read_counter = 0L; |
| int read_buffer_size = 1024 * 64; |
| ReadableByteChannel read_channel = null; |
| ByteBuffer read_buffer = ByteBuffer.allocate(4); |
| |
| public void setReadableByteChannel(ReadableByteChannel channel) { |
| read_channel = channel; |
| if (channel instanceof SocketChannel) { |
| try { |
| ((SocketChannel) channel).socket().setReceiveBufferSize(read_buffer_size); |
| } catch (SocketException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| |
| public Object read() throws IOException { |
| while(true) { |
| if( read_buffer.remaining()!=0 ) { |
| // keep reading from the channel until we fill the read buffer.. |
| int count = read_channel.read(read_buffer); |
| if (count == -1) { |
| throw new EOFException("Peer disconnected"); |
| } else if (count == 0) { |
| return null; |
| } |
| read_counter += count; |
| } else { |
| //read buffer is full.. interpret it.. |
| read_buffer.flip(); |
| |
| if( read_buffer.capacity() == 4 ) { |
| // Finding out the |
| int size = read_buffer.getInt(0); |
| if( size < 4 ) { |
| throw new ProtocolException("Expecting a size greater than 3"); |
| } |
| else if( size > MAX_PACKET_SIZE ) { |
| throw new ProtocolException("Packet length was declared as " + size + " but at most " + MAX_PACKET_SIZE + "is allowed. You can configure this limit with the system property aries.fastbin.max.packet.bytes"); |
| } |
| if( size == 4 ) { |
| // weird.. empty frame.. guess it could happen. |
| Buffer rc = new Buffer(read_buffer); |
| read_buffer = ByteBuffer.allocate(4); |
| return rc; |
| } else { |
| // Resize to the right size.. this resumes the reads.. |
| ByteBuffer next = ByteBuffer.allocate(size); |
| next.putInt(size); |
| read_buffer = next; |
| } |
| } else { |
| // finish loading the rest of the buffer.. |
| Buffer rc = new Buffer(read_buffer); |
| read_buffer = ByteBuffer.allocate(4); |
| return rc; |
| } |
| } |
| } |
| } |
| |
| public long getReadCounter() { |
| return read_counter; |
| } |
| |
| } |