| 1 | /** |
| 2 | * Jexer - Java Text User Interface |
| 3 | * |
| 4 | * License: LGPLv3 or later |
| 5 | * |
| 6 | * This module is licensed under the GNU Lesser General Public License |
| 7 | * Version 3. Please see the file "COPYING" in this directory for more |
| 8 | * information about the GNU Lesser General Public License Version 3. |
| 9 | * |
| 10 | * Copyright (C) 2015 Kevin Lamonte |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU Lesser General Public License |
| 14 | * as published by the Free Software Foundation; either version 3 of |
| 15 | * the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | * General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Lesser General Public |
| 23 | * License along with this program; if not, see |
| 24 | * http://www.gnu.org/licenses/, or write to the Free Software |
| 25 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 26 | * 02110-1301 USA |
| 27 | * |
| 28 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] |
| 29 | * @version 1 |
| 30 | */ |
| 31 | package jexer.net; |
| 32 | |
| 33 | import java.io.InputStream; |
| 34 | import java.io.IOException; |
| 35 | import java.util.Map; |
| 36 | import java.util.TreeMap; |
| 37 | |
| 38 | import jexer.session.SessionInfo; |
| 39 | import static jexer.net.TelnetSocket.*; |
| 40 | |
| 41 | /** |
| 42 | * TelnetInputStream works with TelnetSocket to perform the telnet protocol. |
| 43 | */ |
| 44 | public final class TelnetInputStream extends InputStream implements SessionInfo { |
| 45 | |
| 46 | /** |
| 47 | * The root TelnetSocket that has my telnet protocol state. |
| 48 | */ |
| 49 | private TelnetSocket master; |
| 50 | |
| 51 | /** |
| 52 | * The raw socket's InputStream. |
| 53 | */ |
| 54 | private InputStream input; |
| 55 | |
| 56 | /** |
| 57 | * The telnet-aware OutputStream. |
| 58 | */ |
| 59 | private TelnetOutputStream output; |
| 60 | |
| 61 | /** |
| 62 | * Persistent read buffer. In practice this will only be used if the |
| 63 | * single-byte read() is called sometime. |
| 64 | */ |
| 65 | private byte [] readBuffer; |
| 66 | |
| 67 | /** |
| 68 | * Current writing position in readBuffer - what is passed into |
| 69 | * input.read(). |
| 70 | */ |
| 71 | private int readBufferEnd; |
| 72 | |
| 73 | /** |
| 74 | * Current read position in readBuffer - what is passed to the client in |
| 75 | * response to this.read(). |
| 76 | */ |
| 77 | private int readBufferStart; |
| 78 | |
| 79 | /** |
| 80 | * Package private constructor. |
| 81 | * |
| 82 | * @param master the master TelnetSocket |
| 83 | * @param input the underlying socket's InputStream |
| 84 | * @param output the telnet-aware OutputStream |
| 85 | */ |
| 86 | TelnetInputStream(final TelnetSocket master, final InputStream input, |
| 87 | final TelnetOutputStream output) { |
| 88 | |
| 89 | this.master = master; |
| 90 | this.input = input; |
| 91 | this.output = output; |
| 92 | |
| 93 | // Setup new read buffer |
| 94 | readBuffer = new byte[1024]; |
| 95 | readBufferStart = 0; |
| 96 | readBufferEnd = 0; |
| 97 | } |
| 98 | |
| 99 | // SessionInfo interface -------------------------------------------------- |
| 100 | |
| 101 | /** |
| 102 | * User name. |
| 103 | */ |
| 104 | private String username = ""; |
| 105 | |
| 106 | /** |
| 107 | * Language. |
| 108 | */ |
| 109 | private String language = "en_US"; |
| 110 | |
| 111 | /** |
| 112 | * Text window width. |
| 113 | */ |
| 114 | private int windowWidth = 80; |
| 115 | |
| 116 | /** |
| 117 | * Text window height. |
| 118 | */ |
| 119 | private int windowHeight = 24; |
| 120 | |
| 121 | /** |
| 122 | * Username getter. |
| 123 | * |
| 124 | * @return the username |
| 125 | */ |
| 126 | public String getUsername() { |
| 127 | return this.username; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Username setter. |
| 132 | * |
| 133 | * @param username the value |
| 134 | */ |
| 135 | public void setUsername(final String username) { |
| 136 | this.username = username; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Language getter. |
| 141 | * |
| 142 | * @return the language |
| 143 | */ |
| 144 | public String getLanguage() { |
| 145 | return this.language; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Language setter. |
| 150 | * |
| 151 | * @param language the value |
| 152 | */ |
| 153 | public void setLanguage(final String language) { |
| 154 | this.language = language; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Text window width getter. |
| 159 | * |
| 160 | * @return the window width |
| 161 | */ |
| 162 | public int getWindowWidth() { |
| 163 | return windowWidth; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Text window height getter. |
| 168 | * |
| 169 | * @return the window height |
| 170 | */ |
| 171 | public int getWindowHeight() { |
| 172 | return windowHeight; |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Re-query the text window size. |
| 177 | */ |
| 178 | public void queryWindowSize() { |
| 179 | // NOP |
| 180 | } |
| 181 | |
| 182 | // InputStream interface -------------------------------------------------- |
| 183 | |
| 184 | /** |
| 185 | * Returns an estimate of the number of bytes that can be read (or |
| 186 | * skipped over) from this input stream without blocking by the next |
| 187 | * invocation of a method for this input stream. |
| 188 | * |
| 189 | */ |
| 190 | @Override |
| 191 | public int available() throws IOException { |
| 192 | if (readBuffer == null) { |
| 193 | throw new IOException("InputStream is closed"); |
| 194 | } |
| 195 | if (readBufferEnd - readBufferStart > 0) { |
| 196 | return (readBufferEnd - readBufferStart); |
| 197 | } |
| 198 | return input.available(); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Closes this input stream and releases any system resources associated |
| 203 | * with the stream. |
| 204 | */ |
| 205 | @Override |
| 206 | public void close() throws IOException { |
| 207 | if (readBuffer != null) { |
| 208 | readBuffer = null; |
| 209 | input.close(); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Marks the current position in this input stream. |
| 215 | */ |
| 216 | @Override |
| 217 | public void mark(int readlimit) { |
| 218 | // Do nothing |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Tests if this input stream supports the mark and reset methods. |
| 223 | */ |
| 224 | @Override |
| 225 | public boolean markSupported() { |
| 226 | return false; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Reads the next byte of data from the input stream. |
| 231 | */ |
| 232 | @Override |
| 233 | public int read() throws IOException { |
| 234 | |
| 235 | // If the post-processed buffer has bytes, use that. |
| 236 | if (readBufferEnd - readBufferStart > 0) { |
| 237 | readBufferStart++; |
| 238 | return readBuffer[readBufferStart - 1]; |
| 239 | } |
| 240 | |
| 241 | // The buffer is empty, so reset the indexes to 0. |
| 242 | readBufferStart = 0; |
| 243 | readBufferEnd = 0; |
| 244 | |
| 245 | // Read some fresh data and run it through the telnet protocol. |
| 246 | int rc = readImpl(readBuffer, readBufferEnd, |
| 247 | readBuffer.length - readBufferEnd); |
| 248 | |
| 249 | // If we got something, return it. |
| 250 | if (rc > 0) { |
| 251 | readBufferStart++; |
| 252 | return readBuffer[readBufferStart - 1]; |
| 253 | } |
| 254 | // If we read 0, I screwed up big time. |
| 255 | assert (rc != 0); |
| 256 | |
| 257 | // We read -1 (EOF). |
| 258 | return rc; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Reads some number of bytes from the input stream and stores them into |
| 263 | * the buffer array b. |
| 264 | */ |
| 265 | @Override |
| 266 | public int read(byte[] b) throws IOException { |
| 267 | return read(b, 0, b.length); |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * Reads up to len bytes of data from the input stream into an array of |
| 272 | * bytes. |
| 273 | */ |
| 274 | @Override |
| 275 | public int read(byte[] b, int off, int len) throws IOException { |
| 276 | // The only time we can return 0 is if len is 0, as per the |
| 277 | // InputStream contract. |
| 278 | if (len == 0) { |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | // If the post-processed buffer has bytes, use that. |
| 283 | if (readBufferEnd - readBufferStart > 0) { |
| 284 | int n = Math.min(len, readBufferEnd - readBufferStart); |
| 285 | System.arraycopy(b, off, readBuffer, readBufferStart, n); |
| 286 | readBufferStart += n; |
| 287 | return n; |
| 288 | } |
| 289 | |
| 290 | // The buffer is empty, so reset the indexes to 0. |
| 291 | readBufferStart = 0; |
| 292 | readBufferEnd = 0; |
| 293 | |
| 294 | // The maximum number of bytes we will ask for will definitely be |
| 295 | // within the bounds of what we can return in a single call. |
| 296 | int n = Math.min(len, readBuffer.length); |
| 297 | |
| 298 | // Read some fresh data and run it through the telnet protocol. |
| 299 | int rc = readImpl(readBuffer, readBufferEnd, n); |
| 300 | |
| 301 | // If we got something, return it. |
| 302 | if (rc > 0) { |
| 303 | System.arraycopy(readBuffer, 0, b, off, len); |
| 304 | return rc; |
| 305 | } |
| 306 | // If we read 0, I screwed up big time. |
| 307 | assert (rc != 0); |
| 308 | |
| 309 | // We read -1 (EOF). |
| 310 | return rc; |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Repositions this stream to the position at the time the mark method |
| 315 | * was last called on this input stream. |
| 316 | */ |
| 317 | @Override |
| 318 | public void reset() throws IOException { |
| 319 | throw new IOException("InputStream does not support mark/reset"); |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Skips over and discards n bytes of data from this input stream. |
| 324 | */ |
| 325 | @Override |
| 326 | public long skip(long n) throws IOException { |
| 327 | if (n < 0) { |
| 328 | return 0; |
| 329 | } |
| 330 | for (int i = 0; i < n; i++) { |
| 331 | read(); |
| 332 | } |
| 333 | return n; |
| 334 | } |
| 335 | |
| 336 | // Telnet protocol -------------------------------------------------------- |
| 337 | |
| 338 | /** |
| 339 | * The subnegotiation buffer. |
| 340 | */ |
| 341 | private byte [] subnegBuffer; |
| 342 | |
| 343 | /** |
| 344 | * For debugging, return a descriptive string for this telnet option. |
| 345 | * These are pulled from: http://www.iana.org/assignments/telnet-options |
| 346 | * |
| 347 | * @return a string describing the telnet option code |
| 348 | */ |
| 349 | private String optionString(final int option) { |
| 350 | switch (option) { |
| 351 | case 0: return "Binary Transmission"; |
| 352 | case 1: return "Echo"; |
| 353 | case 2: return "Reconnection"; |
| 354 | case 3: return "Suppress Go Ahead"; |
| 355 | case 4: return "Approx Message Size Negotiation"; |
| 356 | case 5: return "Status"; |
| 357 | case 6: return "Timing Mark"; |
| 358 | case 7: return "Remote Controlled Trans and Echo"; |
| 359 | case 8: return "Output Line Width"; |
| 360 | case 9: return "Output Page Size"; |
| 361 | case 10: return "Output Carriage-Return Disposition"; |
| 362 | case 11: return "Output Horizontal Tab Stops"; |
| 363 | case 12: return "Output Horizontal Tab Disposition"; |
| 364 | case 13: return "Output Formfeed Disposition"; |
| 365 | case 14: return "Output Vertical Tabstops"; |
| 366 | case 15: return "Output Vertical Tab Disposition"; |
| 367 | case 16: return "Output Linefeed Disposition"; |
| 368 | case 17: return "Extended ASCII"; |
| 369 | case 18: return "Logout"; |
| 370 | case 19: return "Byte Macro"; |
| 371 | case 20: return "Data Entry Terminal"; |
| 372 | case 21: return "SUPDUP"; |
| 373 | case 22: return "SUPDUP Output"; |
| 374 | case 23: return "Send Location"; |
| 375 | case 24: return "Terminal Type"; |
| 376 | case 25: return "End of Record"; |
| 377 | case 26: return "TACACS User Identification"; |
| 378 | case 27: return "Output Marking"; |
| 379 | case 28: return "Terminal Location Number"; |
| 380 | case 29: return "Telnet 3270 Regime"; |
| 381 | case 30: return "X.3 PAD"; |
| 382 | case 31: return "Negotiate About Window Size"; |
| 383 | case 32: return "Terminal Speed"; |
| 384 | case 33: return "Remote Flow Control"; |
| 385 | case 34: return "Linemode"; |
| 386 | case 35: return "X Display Location"; |
| 387 | case 36: return "Environment Option"; |
| 388 | case 37: return "Authentication Option"; |
| 389 | case 38: return "Encryption Option"; |
| 390 | case 39: return "New Environment Option"; |
| 391 | case 40: return "TN3270E"; |
| 392 | case 41: return "XAUTH"; |
| 393 | case 42: return "CHARSET"; |
| 394 | case 43: return "Telnet Remote Serial Port (RSP)"; |
| 395 | case 44: return "Com Port Control Option"; |
| 396 | case 45: return "Telnet Suppress Local Echo"; |
| 397 | case 46: return "Telnet Start TLS"; |
| 398 | case 47: return "KERMIT"; |
| 399 | case 48: return "SEND-URL"; |
| 400 | case 49: return "FORWARD_X"; |
| 401 | case 138: return "TELOPT PRAGMA LOGON"; |
| 402 | case 139: return "TELOPT SSPI LOGON"; |
| 403 | case 140: return "TELOPT PRAGMA HEARTBEAT"; |
| 404 | case 255: return "Extended-Options-List"; |
| 405 | default: |
| 406 | if ((option >= 50) && (option <= 137)) { |
| 407 | return "Unassigned"; |
| 408 | } |
| 409 | return "UNKNOWN - OTHER"; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | /** |
| 414 | * Send a DO/DON'T/WILL/WON'T response to the remote side. |
| 415 | * |
| 416 | * @param response a TELNET_DO/DONT/WILL/WONT byte |
| 417 | * @param option telnet option byte (binary mode, term type, etc.) |
| 418 | */ |
| 419 | private void respond(final int response, |
| 420 | final int option) throws IOException { |
| 421 | |
| 422 | byte [] buffer = new byte[3]; |
| 423 | buffer[0] = (byte)TELNET_IAC; |
| 424 | buffer[1] = (byte)response; |
| 425 | buffer[2] = (byte)option; |
| 426 | |
| 427 | output.rawWrite(buffer); |
| 428 | } |
| 429 | |
| 430 | /** |
| 431 | * Tell the remote side we WILL support an option. |
| 432 | * |
| 433 | * @param option telnet option byte (binary mode, term type, etc.) |
| 434 | */ |
| 435 | private void WILL(final int option) throws IOException { |
| 436 | respond(TELNET_WILL, option); |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * Tell the remote side we WON'T support an option. |
| 441 | * |
| 442 | * @param option telnet option byte (binary mode, term type, etc.) |
| 443 | */ |
| 444 | private void WONT(final int option) throws IOException { |
| 445 | respond(TELNET_WONT, option); |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * Tell the remote side we DO support an option. |
| 450 | * |
| 451 | * @param option telnet option byte (binary mode, term type, etc.) |
| 452 | */ |
| 453 | private void DO(final int option) throws IOException { |
| 454 | respond(TELNET_DO, option); |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * Tell the remote side we DON'T support an option. |
| 459 | * |
| 460 | * @param option telnet option byte (binary mode, term type, etc.) |
| 461 | */ |
| 462 | private void DONT(final int option) throws IOException { |
| 463 | respond(TELNET_DONT, option); |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * Tell the remote side we WON't or DON'T support an option. |
| 468 | * |
| 469 | * @param remoteQuery a TELNET_DO/DONT/WILL/WONT byte |
| 470 | * @param option telnet option byte (binary mode, term type, etc.) |
| 471 | */ |
| 472 | private void refuse(final int remoteQuery, |
| 473 | final int option) throws IOException { |
| 474 | |
| 475 | if (remoteQuery == TELNET_DO) { |
| 476 | WONT(option); |
| 477 | } else { |
| 478 | DONT(option); |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | /** |
| 483 | * Build sub-negotiation packet (RFC 855) |
| 484 | * |
| 485 | * @param option telnet option |
| 486 | * @param response output buffer of response bytes |
| 487 | */ |
| 488 | private void telnetSendSubnegResponse(final int option, |
| 489 | final byte [] response) throws IOException { |
| 490 | |
| 491 | byte [] buffer = new byte[response.length + 5]; |
| 492 | buffer[0] = (byte)TELNET_IAC; |
| 493 | buffer[1] = (byte)TELNET_SB; |
| 494 | buffer[2] = (byte)option; |
| 495 | System.arraycopy(response, 0, buffer, 3, response.length); |
| 496 | buffer[response.length + 3] = (byte)TELNET_IAC; |
| 497 | buffer[response.length + 4] = (byte)TELNET_SE; |
| 498 | output.rawWrite(buffer); |
| 499 | } |
| 500 | |
| 501 | /** |
| 502 | * Telnet option: Terminal Speed (RFC 1079). Client side. |
| 503 | */ |
| 504 | private void telnetSendTerminalSpeed() throws IOException { |
| 505 | byte [] response = {0, '3', '8', '4', '0', '0', ',', |
| 506 | '3', '8', '4', '0', '0'}; |
| 507 | telnetSendSubnegResponse(32, response); |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * Telnet option: Terminal Type (RFC 1091). Client side. |
| 512 | */ |
| 513 | private void telnetSendTerminalType() throws IOException { |
| 514 | byte [] response = {0, 'v', 't', '1', '0', '0' }; |
| 515 | telnetSendSubnegResponse(24, response); |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * Telnet option: Terminal Type (RFC 1091). Server side. |
| 520 | */ |
| 521 | private void requestTerminalType() throws IOException { |
| 522 | byte [] response = new byte[1]; |
| 523 | response[0] = 1; |
| 524 | telnetSendSubnegResponse(24, response); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * Telnet option: Terminal Speed (RFC 1079). Server side. |
| 529 | */ |
| 530 | private void requestTerminalSpeed() throws IOException { |
| 531 | byte [] response = new byte[1]; |
| 532 | response[0] = 1; |
| 533 | telnetSendSubnegResponse(32, response); |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * Telnet option: New Environment (RFC 1572). Server side. |
| 538 | */ |
| 539 | private void requestEnvironment() throws IOException { |
| 540 | byte [] response = new byte[1]; |
| 541 | response[0] = 1; |
| 542 | telnetSendSubnegResponse(39, response); |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * Send the options we want to negotiate on: |
| 547 | * Binary Transmission RFC 856 |
| 548 | * Suppress Go Ahead RFC 858 |
| 549 | * Negotiate About Window Size RFC 1073 |
| 550 | * Terminal Type RFC 1091 |
| 551 | * Terminal Speed RFC 1079 |
| 552 | * New Environment RFC 1572 |
| 553 | * |
| 554 | * When run as a server: |
| 555 | * Echo |
| 556 | */ |
| 557 | void telnetSendOptions() throws IOException { |
| 558 | if (master.nvt.binaryMode == false) { |
| 559 | // Binary Transmission: must ask both do and will |
| 560 | DO(0); |
| 561 | WILL(0); |
| 562 | } |
| 563 | |
| 564 | if (master.nvt.goAhead == true) { |
| 565 | // Suppress Go Ahead |
| 566 | DO(3); |
| 567 | WILL(3); |
| 568 | } |
| 569 | |
| 570 | // Server only options |
| 571 | if (master.nvt.isServer == true) { |
| 572 | // Enable Echo - I echo to them, they do not echo back to me. |
| 573 | DONT(1); |
| 574 | WILL(1); |
| 575 | |
| 576 | if (master.nvt.doTermType == true) { |
| 577 | // Terminal type - request it |
| 578 | DO(24); |
| 579 | } |
| 580 | |
| 581 | if (master.nvt.doTermSpeed == true) { |
| 582 | // Terminal speed - request it |
| 583 | DO(32); |
| 584 | } |
| 585 | |
| 586 | if (master.nvt.doNAWS == true) { |
| 587 | // NAWS - request it |
| 588 | DO(31); |
| 589 | } |
| 590 | |
| 591 | if (master.nvt.doEnvironment == true) { |
| 592 | // Environment - request it |
| 593 | DO(39); |
| 594 | } |
| 595 | |
| 596 | } else { |
| 597 | |
| 598 | if (master.nvt.doTermType == true) { |
| 599 | // Terminal type - request it |
| 600 | WILL(24); |
| 601 | } |
| 602 | |
| 603 | if (master.nvt.doTermSpeed == true) { |
| 604 | // Terminal speed - request it |
| 605 | WILL(32); |
| 606 | } |
| 607 | |
| 608 | if (master.nvt.doNAWS == true) { |
| 609 | // NAWS - request it |
| 610 | WILL(31); |
| 611 | } |
| 612 | |
| 613 | if (master.nvt.doEnvironment == true) { |
| 614 | // Environment - request it |
| 615 | WILL(39); |
| 616 | } |
| 617 | |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | /** |
| 622 | * New Environment parsing state. |
| 623 | */ |
| 624 | private enum EnvState { |
| 625 | INIT, |
| 626 | TYPE, |
| 627 | NAME, |
| 628 | VALUE |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * Handle the New Environment option. Note that this implementation |
| 633 | * fails to handle ESC as defined in RFC 1572. |
| 634 | */ |
| 635 | private void handleNewEnvironment() { |
| 636 | Map<StringBuilder, StringBuilder> newEnv = new TreeMap<StringBuilder, StringBuilder>(); |
| 637 | EnvState state = EnvState.INIT; |
| 638 | StringBuilder name = new StringBuilder(); |
| 639 | StringBuilder value = new StringBuilder(); |
| 640 | |
| 641 | for (int i = 0; i < subnegBuffer.length; i++) { |
| 642 | byte b = subnegBuffer[i]; |
| 643 | |
| 644 | switch (state) { |
| 645 | |
| 646 | case INIT: |
| 647 | // Looking for "IS" |
| 648 | if (b == 0) { |
| 649 | state = EnvState.TYPE; |
| 650 | } else { |
| 651 | // The other side isn't following the rules, see ya. |
| 652 | return; |
| 653 | } |
| 654 | break; |
| 655 | |
| 656 | case TYPE: |
| 657 | // Looking for "VAR" or "USERVAR" |
| 658 | if (b == 0) { |
| 659 | // VAR |
| 660 | state = EnvState.NAME; |
| 661 | name = new StringBuilder(); |
| 662 | } else if (b == 3) { |
| 663 | // USERVAR |
| 664 | state = EnvState.NAME; |
| 665 | name = new StringBuilder(); |
| 666 | } else { |
| 667 | // The other side isn't following the rules, see ya |
| 668 | return; |
| 669 | } |
| 670 | break; |
| 671 | |
| 672 | case NAME: |
| 673 | // Looking for "VALUE" or a name byte |
| 674 | if (b == 1) { |
| 675 | // VALUE |
| 676 | state = EnvState.VALUE; |
| 677 | value = new StringBuilder(); |
| 678 | } else { |
| 679 | // Take it as an environment variable name/key byte |
| 680 | name.append((char)b); |
| 681 | } |
| 682 | |
| 683 | break; |
| 684 | |
| 685 | case VALUE: |
| 686 | // Looking for "VAR", "USERVAR", or a name byte, or the end |
| 687 | if (b == 0) { |
| 688 | // VAR |
| 689 | state = EnvState.NAME; |
| 690 | if (value.length() > 0) { |
| 691 | newEnv.put(name, value); |
| 692 | } |
| 693 | name = new StringBuilder(); |
| 694 | } else if (b == 3) { |
| 695 | // USERVAR |
| 696 | state = EnvState.NAME; |
| 697 | if (value.length() > 0) { |
| 698 | newEnv.put(name, value); |
| 699 | } |
| 700 | name = new StringBuilder(); |
| 701 | } else { |
| 702 | // Take it as an environment variable value byte |
| 703 | value.append((char)b); |
| 704 | } |
| 705 | break; |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | if ((name.length() > 0) && (value.length() > 0)) { |
| 710 | newEnv.put(name, value); |
| 711 | } |
| 712 | |
| 713 | for (StringBuilder key: newEnv.keySet()) { |
| 714 | if (key.equals("LANG")) { |
| 715 | language = newEnv.get(key).toString(); |
| 716 | } |
| 717 | if (key.equals("LOGNAME")) { |
| 718 | username = newEnv.get(key).toString(); |
| 719 | } |
| 720 | if (key.equals("USER")) { |
| 721 | username = newEnv.get(key).toString(); |
| 722 | } |
| 723 | } |
| 724 | } |
| 725 | |
| 726 | /** |
| 727 | * Handle an option sub-negotiation. |
| 728 | */ |
| 729 | private void handleSubneg() throws IOException { |
| 730 | byte option; |
| 731 | |
| 732 | // Sanity check: there must be at least 1 byte in subnegBuffer |
| 733 | if (subnegBuffer.length < 1) { |
| 734 | // Buffer too small: the other side is a broken telnetd, it did |
| 735 | // not send the right sub-negotiation data. Bail out now. |
| 736 | return; |
| 737 | } |
| 738 | option = subnegBuffer[0]; |
| 739 | |
| 740 | switch (option) { |
| 741 | |
| 742 | case 24: |
| 743 | // Terminal Type |
| 744 | if ((subnegBuffer.length > 1) && (subnegBuffer[1] == 1)) { |
| 745 | // Server sent "SEND", we say "IS" |
| 746 | telnetSendTerminalType(); |
| 747 | } |
| 748 | if ((subnegBuffer.length > 1) && (subnegBuffer[1] == 0)) { |
| 749 | // Client sent "IS", record it |
| 750 | StringBuilder terminalString = new StringBuilder(); |
| 751 | for (int i = 2; i < subnegBuffer.length; i++) { |
| 752 | terminalString.append((char)subnegBuffer[i]); |
| 753 | } |
| 754 | master.nvt.terminal = terminalString.toString(); |
| 755 | } |
| 756 | break; |
| 757 | |
| 758 | case 32: |
| 759 | // Terminal Speed |
| 760 | if ((subnegBuffer.length > 1) && (subnegBuffer[1] == 1)) { |
| 761 | // Server sent "SEND", we say "IS" |
| 762 | telnetSendTerminalSpeed(); |
| 763 | } |
| 764 | if ((subnegBuffer.length > 1) && (subnegBuffer[1] == 0)) { |
| 765 | // Client sent "IS", record it |
| 766 | StringBuilder speedString = new StringBuilder(); |
| 767 | for (int i = 2; i < subnegBuffer.length; i++) { |
| 768 | speedString.append((char)subnegBuffer[i]); |
| 769 | } |
| 770 | String termSpeed = speedString.toString(); |
| 771 | } |
| 772 | break; |
| 773 | |
| 774 | case 31: |
| 775 | // NAWS |
| 776 | if (subnegBuffer.length >= 5) { |
| 777 | int i = 0; |
| 778 | |
| 779 | i++; |
| 780 | if (subnegBuffer[i] == TELNET_IAC) { |
| 781 | i++; |
| 782 | } |
| 783 | windowWidth = subnegBuffer[i] * 256; |
| 784 | |
| 785 | i++; |
| 786 | if (subnegBuffer[i] == TELNET_IAC) { |
| 787 | i++; |
| 788 | } |
| 789 | windowWidth += subnegBuffer[i]; |
| 790 | |
| 791 | i++; |
| 792 | if (subnegBuffer[i] == TELNET_IAC) { |
| 793 | i++; |
| 794 | } |
| 795 | windowHeight = subnegBuffer[i] * 256; |
| 796 | |
| 797 | i++; |
| 798 | if (subnegBuffer[i] == TELNET_IAC) { |
| 799 | i++; |
| 800 | } |
| 801 | windowHeight += subnegBuffer[i]; |
| 802 | } |
| 803 | break; |
| 804 | |
| 805 | case 39: |
| 806 | // Environment |
| 807 | handleNewEnvironment(); |
| 808 | break; |
| 809 | |
| 810 | default: |
| 811 | // Ignore this one |
| 812 | break; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * Reads up to len bytes of data from the input stream into an array of |
| 818 | * bytes. |
| 819 | */ |
| 820 | private int readImpl(byte[] b, int off, int len) throws IOException { |
| 821 | assert (len > 0); |
| 822 | // TODO |
| 823 | return -1; |
| 824 | } |
| 825 | |
| 826 | |
| 827 | } |