b57d9f307f
- write() now accepts a ChannelPromise and returns ChannelFuture as most users expected. It makes the user's life much easier because it is now much easier to get notified when a specific message has been written. - flush() does not create a ChannelPromise nor returns ChannelFuture. It is now similar to what read() looks like.
467 lines
20 KiB
Java
467 lines
20 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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// (BSD License: http://www.opensource.org/licenses/bsd-license)
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//
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// Copyright (c) 2011, Joe Walnes and contributors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or
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// without modification, are permitted provided that the
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// following conditions are met:
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//
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// * Redistributions of source code must retain the above
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// copyright notice, this list of conditions and the
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// following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the
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// following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// * Neither the name of the Webbit nor the names of
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// its contributors may be used to endorse or promote products
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// derived from this software without specific prior written
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// permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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package io.netty.handler.codec.http.websocketx;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.CorruptedFrameException;
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import io.netty.handler.codec.ReplayingDecoder;
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import io.netty.handler.codec.TooLongFrameException;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.util.List;
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/**
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* Decodes a web socket frame from wire protocol version 8 format. This code was forked from <a
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* href="https://github.com/joewalnes/webbit">webbit</a> and modified.
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*/
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public class WebSocket08FrameDecoder extends ReplayingDecoder<WebSocket08FrameDecoder.State>
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implements WebSocketFrameDecoder {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocket08FrameDecoder.class);
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private static final byte OPCODE_CONT = 0x0;
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private static final byte OPCODE_TEXT = 0x1;
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private static final byte OPCODE_BINARY = 0x2;
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private static final byte OPCODE_CLOSE = 0x8;
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private static final byte OPCODE_PING = 0x9;
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private static final byte OPCODE_PONG = 0xA;
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private UTF8Output fragmentedFramesText;
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private int fragmentedFramesCount;
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private final long maxFramePayloadLength;
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private boolean frameFinalFlag;
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private int frameRsv;
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private int frameOpcode;
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private long framePayloadLength;
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private ByteBuf framePayload;
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private int framePayloadBytesRead;
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private ByteBuf maskingKey;
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private ByteBuf payloadBuffer;
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private final boolean allowExtensions;
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private final boolean maskedPayload;
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private boolean receivedClosingHandshake;
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enum State {
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FRAME_START, MASKING_KEY, PAYLOAD, CORRUPT
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}
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/**
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* Constructor
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*
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* @param maskedPayload
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* Web socket servers must set this to true processed incoming masked payload. Client implementations
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* must set this to false.
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* @param allowExtensions
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* Flag to allow reserved extension bits to be used or not
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* @param maxFramePayloadLength
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* Maximum length of a frame's payload. Setting this to an appropriate value for you application
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* helps check for denial of services attacks.
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*/
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public WebSocket08FrameDecoder(boolean maskedPayload, boolean allowExtensions, int maxFramePayloadLength) {
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super(State.FRAME_START);
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this.maskedPayload = maskedPayload;
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this.allowExtensions = allowExtensions;
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this.maxFramePayloadLength = maxFramePayloadLength;
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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// Discard all data received if closing handshake was received before.
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if (receivedClosingHandshake) {
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in.skipBytes(actualReadableBytes());
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return;
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}
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try {
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switch (state()) {
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case FRAME_START:
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framePayloadBytesRead = 0;
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framePayloadLength = -1;
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framePayload = null;
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payloadBuffer = null;
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// FIN, RSV, OPCODE
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byte b = in.readByte();
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frameFinalFlag = (b & 0x80) != 0;
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frameRsv = (b & 0x70) >> 4;
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frameOpcode = b & 0x0F;
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if (logger.isDebugEnabled()) {
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logger.debug("Decoding WebSocket Frame opCode={}", frameOpcode);
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}
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// MASK, PAYLOAD LEN 1
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b = in.readByte();
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boolean frameMasked = (b & 0x80) != 0;
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int framePayloadLen1 = b & 0x7F;
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if (frameRsv != 0 && !allowExtensions) {
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protocolViolation(ctx, "RSV != 0 and no extension negotiated, RSV:" + frameRsv);
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return;
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}
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if (maskedPayload && !frameMasked) {
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protocolViolation(ctx, "unmasked client to server frame");
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return;
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}
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if (frameOpcode > 7) { // control frame (have MSB in opcode set)
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// control frames MUST NOT be fragmented
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if (!frameFinalFlag) {
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protocolViolation(ctx, "fragmented control frame");
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return;
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}
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// control frames MUST have payload 125 octets or less
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if (framePayloadLen1 > 125) {
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protocolViolation(ctx, "control frame with payload length > 125 octets");
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return;
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}
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// check for reserved control frame opcodes
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if (!(frameOpcode == OPCODE_CLOSE || frameOpcode == OPCODE_PING
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|| frameOpcode == OPCODE_PONG)) {
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protocolViolation(ctx, "control frame using reserved opcode " + frameOpcode);
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return;
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}
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// close frame : if there is a body, the first two bytes of the
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// body MUST be a 2-byte unsigned integer (in network byte
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// order) representing a getStatus code
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if (frameOpcode == 8 && framePayloadLen1 == 1) {
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protocolViolation(ctx, "received close control frame with payload len 1");
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return;
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}
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} else { // data frame
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// check for reserved data frame opcodes
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if (!(frameOpcode == OPCODE_CONT || frameOpcode == OPCODE_TEXT
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|| frameOpcode == OPCODE_BINARY)) {
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protocolViolation(ctx, "data frame using reserved opcode " + frameOpcode);
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return;
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}
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// check opcode vs message fragmentation state 1/2
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if (fragmentedFramesCount == 0 && frameOpcode == OPCODE_CONT) {
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protocolViolation(ctx, "received continuation data frame outside fragmented message");
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return;
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}
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// check opcode vs message fragmentation state 2/2
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if (fragmentedFramesCount != 0 && frameOpcode != OPCODE_CONT && frameOpcode != OPCODE_PING) {
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protocolViolation(ctx,
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"received non-continuation data frame while inside fragmented message");
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return;
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}
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}
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// Read frame payload length
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if (framePayloadLen1 == 126) {
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framePayloadLength = in.readUnsignedShort();
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if (framePayloadLength < 126) {
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protocolViolation(ctx, "invalid data frame length (not using minimal length encoding)");
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return;
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}
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} else if (framePayloadLen1 == 127) {
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framePayloadLength = in.readLong();
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// TODO: check if it's bigger than 0x7FFFFFFFFFFFFFFF, Maybe
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// just check if it's negative?
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if (framePayloadLength < 65536) {
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protocolViolation(ctx, "invalid data frame length (not using minimal length encoding)");
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return;
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}
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} else {
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framePayloadLength = framePayloadLen1;
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}
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if (framePayloadLength > maxFramePayloadLength) {
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protocolViolation(ctx, "Max frame length of " + maxFramePayloadLength + " has been exceeded.");
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return;
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}
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if (logger.isDebugEnabled()) {
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logger.debug("Decoding WebSocket Frame length={}", framePayloadLength);
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}
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checkpoint(State.MASKING_KEY);
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case MASKING_KEY:
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if (maskedPayload) {
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maskingKey = in.readBytes(4);
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}
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checkpoint(State.PAYLOAD);
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case PAYLOAD:
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// Sometimes, the payload may not be delivered in 1 nice packet
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// We need to accumulate the data until we have it all
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int rbytes = actualReadableBytes();
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long willHaveReadByteCount = framePayloadBytesRead + rbytes;
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// logger.debug("Frame rbytes=" + rbytes + " willHaveReadByteCount="
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// + willHaveReadByteCount + " framePayloadLength=" +
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// framePayloadLength);
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if (willHaveReadByteCount == framePayloadLength) {
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// We have all our content so proceed to process
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payloadBuffer = ctx.alloc().buffer(rbytes);
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payloadBuffer.writeBytes(in, rbytes);
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} else if (willHaveReadByteCount < framePayloadLength) {
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// We don't have all our content so accumulate payload.
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// Returning null means we will get called back
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if (framePayload == null) {
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framePayload = ctx.alloc().buffer(toFrameLength(framePayloadLength));
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}
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framePayload.writeBytes(in, rbytes);
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framePayloadBytesRead += rbytes;
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// Return null to wait for more bytes to arrive
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return;
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} else if (willHaveReadByteCount > framePayloadLength) {
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// We have more than what we need so read up to the end of frame
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// Leave the remainder in the buffer for next frame
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if (framePayload == null) {
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framePayload = ctx.alloc().buffer(toFrameLength(framePayloadLength));
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}
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framePayload.writeBytes(in, toFrameLength(framePayloadLength - framePayloadBytesRead));
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}
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// Now we have all the data, the next checkpoint must be the next
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// frame
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checkpoint(State.FRAME_START);
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// Take the data that we have in this packet
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if (framePayload == null) {
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framePayload = payloadBuffer;
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} else if (payloadBuffer != null) {
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framePayload.writeBytes(payloadBuffer);
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payloadBuffer.release();
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}
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// Unmask data if needed
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if (maskedPayload) {
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unmask(framePayload);
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}
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// Processing ping/pong/close frames because they cannot be
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// fragmented
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if (frameOpcode == OPCODE_PING) {
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out.add(new PingWebSocketFrame(frameFinalFlag, frameRsv, framePayload));
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return;
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}
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if (frameOpcode == OPCODE_PONG) {
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out.add(new PongWebSocketFrame(frameFinalFlag, frameRsv, framePayload));
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return;
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}
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if (frameOpcode == OPCODE_CLOSE) {
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checkCloseFrameBody(ctx, framePayload);
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receivedClosingHandshake = true;
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out.add(new CloseWebSocketFrame(frameFinalFlag, frameRsv, framePayload));
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return;
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}
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// Processing for possible fragmented messages for text and binary
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// frames
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String aggregatedText = null;
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if (frameFinalFlag) {
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// Final frame of the sequence. Apparently ping frames are
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// allowed in the middle of a fragmented message
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if (frameOpcode != OPCODE_PING) {
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fragmentedFramesCount = 0;
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// Check text for UTF8 correctness
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if (frameOpcode == OPCODE_TEXT || fragmentedFramesText != null) {
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// Check UTF-8 correctness for this payload
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checkUTF8String(ctx, framePayload);
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// This does a second check to make sure UTF-8
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// correctness for entire text message
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aggregatedText = fragmentedFramesText.toString();
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fragmentedFramesText = null;
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}
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}
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} else {
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// Not final frame so we can expect more frames in the
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// fragmented sequence
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if (fragmentedFramesCount == 0) {
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// First text or binary frame for a fragmented set
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fragmentedFramesText = null;
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if (frameOpcode == OPCODE_TEXT) {
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checkUTF8String(ctx, framePayload);
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}
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} else {
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// Subsequent frames - only check if init frame is text
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if (fragmentedFramesText != null) {
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checkUTF8String(ctx, framePayload);
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}
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}
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// Increment counter
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fragmentedFramesCount++;
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}
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// Return the frame
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if (frameOpcode == OPCODE_TEXT) {
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out.add(new TextWebSocketFrame(frameFinalFlag, frameRsv, framePayload));
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return;
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} else if (frameOpcode == OPCODE_BINARY) {
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out.add(new BinaryWebSocketFrame(frameFinalFlag, frameRsv, framePayload));
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return;
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} else if (frameOpcode == OPCODE_CONT) {
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out.add(new ContinuationWebSocketFrame(frameFinalFlag, frameRsv, framePayload, aggregatedText));
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return;
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} else {
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throw new UnsupportedOperationException("Cannot decode web socket frame with opcode: "
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+ frameOpcode);
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}
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case CORRUPT:
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// If we don't keep reading Netty will throw an exception saying
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// we can't return null if no bytes read and state not changed.
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in.readByte();
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return;
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default:
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throw new Error("Shouldn't reach here.");
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}
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} catch (Exception e) {
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if (payloadBuffer != null) {
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if (payloadBuffer.refCnt() > 0) {
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payloadBuffer.release();
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}
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payloadBuffer = null;
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}
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if (framePayload != null) {
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if (framePayload.refCnt() > 0) {
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framePayload.release();
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}
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framePayload = null;
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}
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throw e;
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}
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}
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private void unmask(ByteBuf frame) {
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for (int i = frame.readerIndex(); i < frame.writerIndex(); i++) {
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frame.setByte(i, frame.getByte(i) ^ maskingKey.getByte(i % 4));
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}
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}
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private void protocolViolation(ChannelHandlerContext ctx, String reason) {
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checkpoint(State.CORRUPT);
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if (ctx.channel().isActive()) {
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ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
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}
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throw new CorruptedFrameException(reason);
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}
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private static int toFrameLength(long l) {
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if (l > Integer.MAX_VALUE) {
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throw new TooLongFrameException("Length:" + l);
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} else {
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return (int) l;
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}
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}
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private void checkUTF8String(ChannelHandlerContext ctx, ByteBuf buffer) {
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try {
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if (fragmentedFramesText == null) {
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fragmentedFramesText = new UTF8Output(buffer);
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} else {
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fragmentedFramesText.write(buffer);
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}
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} catch (UTF8Exception ex) {
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protocolViolation(ctx, "invalid UTF-8 bytes");
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}
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}
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/** */
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protected void checkCloseFrameBody(
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ChannelHandlerContext ctx, ByteBuf buffer) {
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if (buffer == null || buffer.capacity() == 0) {
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return;
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}
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if (buffer.capacity() == 1) {
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protocolViolation(ctx, "Invalid close frame body");
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}
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// Save reader index
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int idx = buffer.readerIndex();
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buffer.readerIndex(0);
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// Must have 2 byte integer within the valid range
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int statusCode = buffer.readShort();
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if (statusCode >= 0 && statusCode <= 999 || statusCode >= 1004 && statusCode <= 1006
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|| statusCode >= 1012 && statusCode <= 2999) {
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protocolViolation(ctx, "Invalid close frame getStatus code: " + statusCode);
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}
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// May have UTF-8 message
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if (buffer.isReadable()) {
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try {
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new UTF8Output(buffer);
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} catch (UTF8Exception ex) {
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protocolViolation(ctx, "Invalid close frame reason text. Invalid UTF-8 bytes");
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}
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}
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// Restore reader index
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buffer.readerIndex(idx);
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}
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}
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