Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | package org.eclipse.jetty.websocket; |
| 20 | |
| 21 | import java.io.IOException; |
| 22 | |
| 23 | import org.eclipse.jetty.io.Buffer; |
| 24 | import org.eclipse.jetty.io.Buffers; |
| 25 | import org.eclipse.jetty.io.EndPoint; |
| 26 | import org.eclipse.jetty.util.log.Log; |
| 27 | import org.eclipse.jetty.util.log.Logger; |
| 28 | |
| 29 | |
| 30 | |
| 31 | /* ------------------------------------------------------------ */ |
| 32 | /** |
| 33 | * Parser the WebSocket protocol. |
| 34 | * |
| 35 | */ |
| 36 | public class WebSocketParserD06 implements WebSocketParser |
| 37 | { |
| 38 | private static final Logger LOG = Log.getLogger(WebSocketParserD06.class); |
| 39 | |
| 40 | public enum State { |
| 41 | |
| 42 | START(0), MASK(4), OPCODE(1), LENGTH_7(1), LENGTH_16(2), LENGTH_63(8), DATA(0), SKIP(1); |
| 43 | |
| 44 | int _needs; |
| 45 | |
| 46 | State(int needs) |
| 47 | { |
| 48 | _needs=needs; |
| 49 | } |
| 50 | |
| 51 | int getNeeds() |
| 52 | { |
| 53 | return _needs; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | |
| 58 | private final WebSocketBuffers _buffers; |
| 59 | private final EndPoint _endp; |
| 60 | private final FrameHandler _handler; |
| 61 | private final boolean _masked; |
| 62 | private State _state; |
| 63 | private Buffer _buffer; |
| 64 | private byte _flags; |
| 65 | private byte _opcode; |
| 66 | private int _bytesNeeded; |
| 67 | private long _length; |
| 68 | private final byte[] _mask = new byte[4]; |
| 69 | private int _m; |
| 70 | |
| 71 | /* ------------------------------------------------------------ */ |
| 72 | /** |
| 73 | * @param buffers The buffers to use for parsing. Only the {@link Buffers#getBuffer()} is used. |
| 74 | * This should be a direct buffer if binary data is mostly used or an indirect buffer if utf-8 data |
| 75 | * is mostly used. |
| 76 | * @param endp the endpoint |
| 77 | * @param handler the handler to notify when a parse event occurs |
| 78 | * @param masked whether masking should be handled |
| 79 | */ |
| 80 | public WebSocketParserD06(WebSocketBuffers buffers, EndPoint endp, FrameHandler handler, boolean masked) |
| 81 | { |
| 82 | _buffers=buffers; |
| 83 | _endp=endp; |
| 84 | _handler=handler; |
| 85 | _masked=masked; |
| 86 | _state=State.START; |
| 87 | } |
| 88 | |
| 89 | /* ------------------------------------------------------------ */ |
| 90 | public boolean isBufferEmpty() |
| 91 | { |
| 92 | return _buffer==null || _buffer.length()==0; |
| 93 | } |
| 94 | |
| 95 | /* ------------------------------------------------------------ */ |
| 96 | public Buffer getBuffer() |
| 97 | { |
| 98 | return _buffer; |
| 99 | } |
| 100 | |
| 101 | /* ------------------------------------------------------------ */ |
| 102 | /** Parse to next event. |
| 103 | * Parse to the next {@link WebSocketParser.FrameHandler} event or until no more data is |
| 104 | * available. Fill data from the {@link EndPoint} only as necessary. |
| 105 | * @return An indication of progress or otherwise. -1 indicates EOF, 0 indicates |
| 106 | * that no bytes were read and no messages parsed. A positive number indicates either |
| 107 | * the bytes filled or the messages parsed. |
| 108 | */ |
| 109 | public int parseNext() |
| 110 | { |
| 111 | if (_buffer==null) |
| 112 | _buffer=_buffers.getBuffer(); |
| 113 | |
| 114 | int total_filled=0; |
| 115 | int events=0; |
| 116 | |
| 117 | // Loop until an datagram call back or can't fill anymore |
| 118 | while(true) |
| 119 | { |
| 120 | int available=_buffer.length(); |
| 121 | |
| 122 | // Fill buffer if we need a byte or need length |
| 123 | while (available<(_state==State.SKIP?1:_bytesNeeded)) |
| 124 | { |
| 125 | // compact to mark (set at start of data) |
| 126 | _buffer.compact(); |
| 127 | |
| 128 | // if no space, then the data is too big for buffer |
| 129 | if (_buffer.space() == 0) |
| 130 | throw new IllegalStateException("FULL: "+_state+" "+_bytesNeeded+">"+_buffer.capacity()); |
| 131 | |
| 132 | // catch IOExceptions (probably EOF) and try to parse what we have |
| 133 | try |
| 134 | { |
| 135 | int filled=_endp.isOpen()?_endp.fill(_buffer):-1; |
| 136 | if (filled<=0) |
| 137 | return (total_filled+events)>0?(total_filled+events):filled; |
| 138 | total_filled+=filled; |
| 139 | available=_buffer.length(); |
| 140 | } |
| 141 | catch(IOException e) |
| 142 | { |
| 143 | LOG.debug(e); |
| 144 | return (total_filled+events)>0?(total_filled+events):-1; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | // if we are here, then we have sufficient bytes to process the current state. |
| 149 | |
| 150 | // Parse the buffer byte by byte (unless it is STATE_DATA) |
| 151 | byte b; |
| 152 | while (_state!=State.DATA && available>=(_state==State.SKIP?1:_bytesNeeded)) |
| 153 | { |
| 154 | switch (_state) |
| 155 | { |
| 156 | case START: |
| 157 | _state=_masked?State.MASK:State.OPCODE; |
| 158 | _bytesNeeded=_state.getNeeds(); |
| 159 | continue; |
| 160 | |
| 161 | case MASK: |
| 162 | _buffer.get(_mask,0,4); |
| 163 | available-=4; |
| 164 | _state=State.OPCODE; |
| 165 | _bytesNeeded=_state.getNeeds(); |
| 166 | _m=0; |
| 167 | continue; |
| 168 | |
| 169 | case OPCODE: |
| 170 | b=_buffer.get(); |
| 171 | available--; |
| 172 | if (_masked) |
| 173 | b^=_mask[_m++%4]; |
| 174 | _opcode=(byte)(b&0xf); |
| 175 | _flags=(byte)(0xf&(b>>4)); |
| 176 | |
| 177 | if (WebSocketConnectionD06.isControlFrame(_opcode)&&!WebSocketConnectionD06.isLastFrame(_flags)) |
| 178 | { |
| 179 | _state=State.SKIP; |
| 180 | events++; |
| 181 | _handler.close(WebSocketConnectionD06.CLOSE_PROTOCOL,"fragmented control"); |
| 182 | } |
| 183 | else |
| 184 | _state=State.LENGTH_7; |
| 185 | |
| 186 | _bytesNeeded=_state.getNeeds(); |
| 187 | continue; |
| 188 | |
| 189 | case LENGTH_7: |
| 190 | b=_buffer.get(); |
| 191 | available--; |
| 192 | if (_masked) |
| 193 | b^=_mask[_m++%4]; |
| 194 | switch(b) |
| 195 | { |
| 196 | case 127: |
| 197 | _length=0; |
| 198 | _state=State.LENGTH_63; |
| 199 | _bytesNeeded=_state.getNeeds(); |
| 200 | break; |
| 201 | case 126: |
| 202 | _length=0; |
| 203 | _state=State.LENGTH_16; |
| 204 | _bytesNeeded=_state.getNeeds(); |
| 205 | break; |
| 206 | default: |
| 207 | _length=(0x7f&b); |
| 208 | _bytesNeeded=(int)_length; |
| 209 | _state=State.DATA; |
| 210 | } |
| 211 | continue; |
| 212 | |
| 213 | case LENGTH_16: |
| 214 | b=_buffer.get(); |
| 215 | available--; |
| 216 | if (_masked) |
| 217 | b^=_mask[_m++%4]; |
| 218 | _length = _length*0x100 + (0xff&b); |
| 219 | if (--_bytesNeeded==0) |
| 220 | { |
| 221 | _bytesNeeded=(int)_length; |
| 222 | if (_length>_buffer.capacity()) |
| 223 | { |
| 224 | _state=State.SKIP; |
| 225 | events++; |
| 226 | _handler.close(WebSocketConnectionD06.CLOSE_LARGE,"frame size "+_length+">"+_buffer.capacity()); |
| 227 | } |
| 228 | else |
| 229 | { |
| 230 | _state=State.DATA; |
| 231 | } |
| 232 | } |
| 233 | continue; |
| 234 | |
| 235 | case LENGTH_63: |
| 236 | b=_buffer.get(); |
| 237 | available--; |
| 238 | if (_masked) |
| 239 | b^=_mask[_m++%4]; |
| 240 | _length = _length*0x100 + (0xff&b); |
| 241 | if (--_bytesNeeded==0) |
| 242 | { |
| 243 | _bytesNeeded=(int)_length; |
| 244 | if (_length>=_buffer.capacity()) |
| 245 | { |
| 246 | _state=State.SKIP; |
| 247 | events++; |
| 248 | _handler.close(WebSocketConnectionD06.CLOSE_LARGE,"frame size "+_length+">"+_buffer.capacity()); |
| 249 | } |
| 250 | else |
| 251 | { |
| 252 | _state=State.DATA; |
| 253 | } |
| 254 | } |
| 255 | continue; |
| 256 | |
| 257 | case SKIP: |
| 258 | int skip=Math.min(available,_bytesNeeded); |
| 259 | _buffer.skip(skip); |
| 260 | available-=skip; |
| 261 | _bytesNeeded-=skip; |
| 262 | if (_bytesNeeded==0) |
| 263 | _state=State.START; |
| 264 | |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | if (_state==State.DATA && available>=_bytesNeeded) |
| 269 | { |
| 270 | Buffer data =_buffer.get(_bytesNeeded); |
| 271 | if (_masked) |
| 272 | { |
| 273 | if (data.array()==null) |
| 274 | data=_buffer.asMutableBuffer(); |
| 275 | byte[] array = data.array(); |
| 276 | final int end=data.putIndex(); |
| 277 | for (int i=data.getIndex();i<end;i++) |
| 278 | array[i]^=_mask[_m++%4]; |
| 279 | } |
| 280 | |
| 281 | // System.err.printf("%s %s %s >>\n",TypeUtil.toHexString(_flags),TypeUtil.toHexString(_opcode),data.length()); |
| 282 | events++; |
| 283 | _handler.onFrame(_flags, _opcode, data); |
| 284 | _bytesNeeded=0; |
| 285 | _state=State.START; |
| 286 | |
| 287 | if (_buffer.length()==0) |
| 288 | { |
| 289 | _buffers.returnBuffer(_buffer); |
| 290 | _buffer=null; |
| 291 | } |
| 292 | |
| 293 | return total_filled+events; |
| 294 | } |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | /* ------------------------------------------------------------ */ |
| 299 | public void fill(Buffer buffer) |
| 300 | { |
| 301 | if (buffer!=null && buffer.length()>0) |
| 302 | { |
| 303 | if (_buffer==null) |
| 304 | _buffer=_buffers.getBuffer(); |
| 305 | _buffer.put(buffer); |
| 306 | buffer.clear(); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | } |