/*
* JBoss, Home of Professional Open Source.
* Copyright 2012 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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 io.undertow.websockets.core.protocol.version07;
import io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel;
import io.undertow.websockets.core.StreamSinkFrameChannel;
import io.undertow.websockets.core.StreamSourceFrameChannel;
import io.undertow.websockets.core.WebSocketChannel;
import io.undertow.websockets.core.WebSocketException;
import io.undertow.websockets.core.WebSocketFrameCorruptedException;
import io.undertow.websockets.core.WebSocketFrameType;
import io.undertow.websockets.core.WebSocketLogger;
import io.undertow.websockets.core.WebSocketMessages;
import io.undertow.websockets.core.WebSocketVersion;
import io.undertow.websockets.core.function.ChannelFunction;
import org.xnio.Pool;
import org.xnio.Pooled;
import org.xnio.StreamConnection;
import java.nio.ByteBuffer;
/**
* {@link WebSocketChannel} which is used for {@link WebSocketVersion#V08}
*
* @author <a href="mailto:nmaurer@redhat.com">Norman Maurer</a>
*/
public class WebSocket07Channel extends WebSocketChannel {
private enum State {
READING_FIRST,
READING_SECOND,
READING_EXTENDED_SIZE1,
READING_EXTENDED_SIZE2,
READING_EXTENDED_SIZE3,
READING_EXTENDED_SIZE4,
READING_EXTENDED_SIZE5,
READING_EXTENDED_SIZE6,
READING_EXTENDED_SIZE7,
READING_EXTENDED_SIZE8,
READING_MASK_1,
READING_MASK_2,
READING_MASK_3,
READING_MASK_4,
DONE,
}
private int fragmentedFramesCount;
private final ByteBuffer lengthBuffer = ByteBuffer.allocate(8);
private UTF8Checker checker;
protected static final byte OPCODE_CONT = 0x0;
protected static final byte OPCODE_TEXT = 0x1;
protected static final byte OPCODE_BINARY = 0x2;
protected static final byte OPCODE_CLOSE = 0x8;
protected static final byte OPCODE_PING = 0x9;
protected static final byte OPCODE_PONG = 0xA;
private static final ChannelFunction[] EMPTY_FUNCTIONS = new ChannelFunction[0];
/**
* Create a new {@link WebSocket07Channel}
*
* @param channel The {@link StreamConnection} over which the WebSocket Frames should get send and received.
* Be aware that it already must be "upgraded".
* @param bufferPool The {@link Pool} which will be used to acquire {@link ByteBuffer}'s from.
* @param wsUrl The url for which the {@link WebSocket07Channel} was created.
*/
public WebSocket07Channel(StreamConnection channel, Pool<ByteBuffer> bufferPool,
String wsUrl, String subProtocol, final boolean client, boolean allowExtensions) {
super(channel, bufferPool, WebSocketVersion.V08, wsUrl, subProtocol, client, allowExtensions);
}
@Override
protected PartialFrame receiveFrame() {
return new WebSocketFrameHeader();
}
@Override
protected void markReadsBroken(Throwable cause) {
super.markReadsBroken(cause);
}
@Override
protected StreamSinkFrameChannel createStreamSinkChannel(WebSocketFrameType type, long payloadSize) {
switch (type) {
case TEXT:
return new WebSocket07TextFrameSinkChannel(this, payloadSize);
case BINARY:
return new WebSocket07BinaryFrameSinkChannel(this, payloadSize);
case CLOSE:
return new WebSocket07CloseFrameSinkChannel(this, payloadSize);
case PONG:
return new WebSocket07PongFrameSinkChannel(this, payloadSize);
case PING:
return new WebSocket07PingFrameSinkChannel(this, payloadSize);
default:
throw WebSocketMessages.MESSAGES.unsupportedFrameType(type);
}
}
class WebSocketFrameHeader implements PartialFrame {
private boolean frameFinalFlag;
private int frameRsv;
private int frameOpcode;
private int maskingKey;
private boolean frameMasked;
private long framePayloadLength;
private State state = State.READING_FIRST;
private int framePayloadLen1;
private boolean done = false;
@Override
public StreamSourceFrameChannel getChannel(Pooled<ByteBuffer> pooled) {
StreamSourceFrameChannel channel = createChannel(pooled);
if (frameFinalFlag) {
channel.finalFrame();
} else {
fragmentedChannel = channel;
}
return channel;
}
public StreamSourceFrameChannel createChannel(Pooled<ByteBuffer> pooled) {
// Processing ping/pong/close frames because they cannot be
// fragmented as per spec
if (frameOpcode == OPCODE_PING) {
if (frameMasked) {
return new WebSocket07PingFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, new Masker(maskingKey), pooled, framePayloadLength);
} else {
return new WebSocket07PingFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, pooled, framePayloadLength);
}
}
if (frameOpcode == OPCODE_PONG) {
if (frameMasked) {
return new WebSocket07PongFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, new Masker(maskingKey), pooled, framePayloadLength);
} else {
return new WebSocket07PongFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, pooled, framePayloadLength);
}
}
if (frameOpcode == OPCODE_CLOSE) {
if (frameMasked) {
return new WebSocket07CloseFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, new Masker(maskingKey), pooled, framePayloadLength);
} else {
return new WebSocket07CloseFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, pooled, framePayloadLength);
}
}
if (frameOpcode == OPCODE_TEXT) {
// try to grab the checker which was used before
UTF8Checker checker = WebSocket07Channel.this.checker;
if (checker == null) {
checker = new UTF8Checker();
}
if (!frameFinalFlag) {
// if this is not the final fragment store the used checker to use it in later fragments also
WebSocket07Channel.this.checker = checker;
} else {
// was the final fragment reset the checker to null
WebSocket07Channel.this.checker = null;
}
if (frameMasked) {
return new WebSocket07TextFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, frameFinalFlag, new Masker(maskingKey), checker, pooled, framePayloadLength);
} else {
return new WebSocket07TextFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, frameFinalFlag, checker, pooled, framePayloadLength);
}
} else if (frameOpcode == OPCODE_BINARY) {
if (frameMasked) {
return new WebSocket07BinaryFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, frameFinalFlag, new Masker(maskingKey), pooled, framePayloadLength);
} else {
return new WebSocket07BinaryFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, frameFinalFlag, pooled, framePayloadLength);
}
} else if (frameOpcode == OPCODE_CONT) {
final ChannelFunction[] functions;
if (frameMasked && checker != null) {
functions = new ChannelFunction[2];
functions[0] = new Masker(maskingKey);
functions[1] = checker;
} else if (frameMasked) {
functions = new ChannelFunction[1];
functions[0] = new Masker(maskingKey);
} else if (checker != null) {
functions = new ChannelFunction[1];
functions[0] = checker;
} else {
functions = EMPTY_FUNCTIONS;
}
if (frameMasked) {
return new WebSocket07ContinuationFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, frameFinalFlag, pooled, framePayloadLength, functions);
} else {
return new WebSocket07ContinuationFrameSourceChannel(WebSocket07Channel.this, framePayloadLength, frameRsv, frameFinalFlag, pooled, framePayloadLength, functions);
}
} else {
throw WebSocketMessages.MESSAGES.unsupportedOpCode(frameOpcode);
}
}
@Override
public void handle(final ByteBuffer buffer) throws WebSocketException {
if (!buffer.hasRemaining()) {
return;
}
while (state != State.DONE) {
byte b;
switch (state) {
case READING_FIRST:
// Read FIN, RSV, OPCODE
b = buffer.get();
frameFinalFlag = (b & 0x80) != 0;
frameRsv = (b & 0x70) >> 4;
frameOpcode = b & 0x0F;
if (WebSocketLogger.REQUEST_LOGGER.isDebugEnabled()) {
WebSocketLogger.REQUEST_LOGGER.decodingFrameWithOpCode(frameOpcode);
}
state = State.READING_SECOND;
// clear the lengthBuffer to reuse it later
lengthBuffer.clear();
case READING_SECOND:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
// Read MASK, PAYLOAD LEN 1
//
frameMasked = (b & 0x80) != 0;
framePayloadLen1 = b & 0x7F;
if (frameRsv != 0 && !areExtensionsSupported()) {
throw WebSocketMessages.MESSAGES.extensionsNotAllowed(frameRsv);
}
if (frameOpcode > 7) { // control frame (have MSB in opcode set)
validateControlFrame();
} else { // data frame
validateDataFrame();
}
if (framePayloadLen1 == 126 || framePayloadLen1 == 127) {
state = State.READING_EXTENDED_SIZE1;
} else {
framePayloadLength = framePayloadLen1;
if (frameMasked) {
state = State.READING_MASK_1;
} else {
state = State.DONE;
}
continue;
}
case READING_EXTENDED_SIZE1:
// Read frame payload length
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
state = State.READING_EXTENDED_SIZE2;
case READING_EXTENDED_SIZE2:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
if (framePayloadLen1 == 126) {
lengthBuffer.flip();
// must be unsigned short
framePayloadLength = lengthBuffer.getShort() & 0xFFFF;
if (frameMasked) {
state = State.READING_MASK_1;
} else {
state = State.DONE;
}
continue;
}
state = State.READING_EXTENDED_SIZE3;
case READING_EXTENDED_SIZE3:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
state = State.READING_EXTENDED_SIZE4;
case READING_EXTENDED_SIZE4:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
state = State.READING_EXTENDED_SIZE5;
case READING_EXTENDED_SIZE5:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
state = State.READING_EXTENDED_SIZE6;
case READING_EXTENDED_SIZE6:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
state = State.READING_EXTENDED_SIZE7;
case READING_EXTENDED_SIZE7:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
case READING_EXTENDED_SIZE8:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
lengthBuffer.put(b);
lengthBuffer.flip();
framePayloadLength = lengthBuffer.getLong();
if (frameMasked) {
state = State.READING_MASK_1;
} else {
state = State.DONE;
break;
}
case READING_MASK_1:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
maskingKey = b & 0xFF;
state = State.READING_MASK_2;
case READING_MASK_2:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
maskingKey = maskingKey << 8 | b & 0xFF;
state = State.READING_MASK_3;
case READING_MASK_3:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
maskingKey = maskingKey << 8 | b & 0xFF;
state = State.READING_MASK_4;
case READING_MASK_4:
if (!buffer.hasRemaining()) {
return;
}
b = buffer.get();
maskingKey = maskingKey << 8 | b & 0xFF;
state = State.DONE;
break;
default:
throw new IllegalStateException(state.toString());
}
}
if (frameFinalFlag) {
// check if the frame is a ping frame as these are allowed in the middle
if (frameOpcode != OPCODE_PING) {
fragmentedFramesCount = 0;
}
} else {
// Increment counter
fragmentedFramesCount++;
}
done = true;
}
private void validateDataFrame() throws WebSocketFrameCorruptedException {
if (!isClient() && !frameMasked) {
throw WebSocketMessages.MESSAGES.frameNotMasked();
}
// check for reserved data frame opcodes
if (!(frameOpcode == OPCODE_CONT || frameOpcode == OPCODE_TEXT || frameOpcode == OPCODE_BINARY)) {
throw WebSocketMessages.MESSAGES.reservedOpCodeInDataFrame(frameOpcode);
}
// check opcode vs message fragmentation state 1/2
if (fragmentedFramesCount == 0 && frameOpcode == OPCODE_CONT) {
throw WebSocketMessages.MESSAGES.continuationFrameOutsideFragmented();
}
// check opcode vs message fragmentation state 2/2
if (fragmentedFramesCount != 0 && frameOpcode != OPCODE_CONT) {
throw WebSocketMessages.MESSAGES.nonContinuationFrameInsideFragmented();
}
}
private void validateControlFrame() throws WebSocketFrameCorruptedException {
// control frames MUST NOT be fragmented
if (!frameFinalFlag) {
throw WebSocketMessages.MESSAGES.fragmentedControlFrame();
}
// control frames MUST have payload 125 octets or less as stated in the spec
if (framePayloadLen1 > 125) {
throw WebSocketMessages.MESSAGES.toBigControlFrame();
}
// check for reserved control frame opcodes
if (!(frameOpcode == OPCODE_CLOSE || frameOpcode == OPCODE_PING || frameOpcode == OPCODE_PONG)) {
throw WebSocketMessages.MESSAGES.reservedOpCodeInControlFrame(frameOpcode);
}
// close frame : if there is a body, the first two bytes of the
// body MUST be a 2-byte unsigned integer (in network byte
// order) representing a status code
if (frameOpcode == 8 && framePayloadLen1 == 1) {
throw WebSocketMessages.MESSAGES.controlFrameWithPayloadLen1();
}
}
@Override
public boolean isDone() {
return done;
}
@Override
public long getFrameLength() {
return framePayloadLength;
}
int getMaskingKey() {
return maskingKey;
}
@Override
public AbstractFramedStreamSourceChannel<?, ?, ?> getExistingChannel() {
if (frameOpcode == OPCODE_CONT) {
StreamSourceFrameChannel ret = fragmentedChannel;
if(frameFinalFlag) {
fragmentedChannel = null;
ret.finalFrame(); //TODO: should be in handle header data, maybe
}
return ret;
}
return null;
}
}
}