J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.net.ftp; |
| 27 | |
| 28 | import java.util.StringTokenizer; |
| 29 | import java.util.regex.*; |
| 30 | import java.io.*; |
| 31 | import java.net.*; |
| 32 | import sun.net.TransferProtocolClient; |
| 33 | import sun.net.TelnetInputStream; |
| 34 | import sun.net.TelnetOutputStream; |
| 35 | import sun.misc.RegexpPool; |
| 36 | import java.security.AccessController; |
| 37 | import java.security.PrivilegedAction; |
| 38 | |
| 39 | /** |
| 40 | * This class implements the FTP client. |
| 41 | * |
| 42 | * @author Jonathan Payne |
| 43 | */ |
| 44 | |
| 45 | public class FtpClient extends TransferProtocolClient { |
| 46 | public static final int FTP_PORT = 21; |
| 47 | |
| 48 | static int FTP_SUCCESS = 1; |
| 49 | static int FTP_TRY_AGAIN = 2; |
| 50 | static int FTP_ERROR = 3; |
| 51 | |
| 52 | /** remember the ftp server name because we may need it */ |
| 53 | private String serverName = null; |
| 54 | |
| 55 | /** socket for data transfer */ |
| 56 | private boolean replyPending = false; |
| 57 | private boolean binaryMode = false; |
| 58 | private boolean loggedIn = false; |
| 59 | |
| 60 | /** regexp pool of hosts for which we should connect directly, not Proxy |
| 61 | * these are intialized from a property. |
| 62 | */ |
| 63 | private static RegexpPool nonProxyHostsPool = null; |
| 64 | |
| 65 | /** The string soucre of nonProxyHostsPool |
| 66 | */ |
| 67 | private static String nonProxyHostsSource = null; |
| 68 | |
| 69 | /** last command issued */ |
| 70 | String command; |
| 71 | |
| 72 | /** The last reply code from the ftp daemon. */ |
| 73 | int lastReplyCode; |
| 74 | |
| 75 | /** Welcome message from the server, if any. */ |
| 76 | public String welcomeMsg; |
| 77 | |
| 78 | |
| 79 | /* these methods are used to determine whether ftp urls are sent to */ |
| 80 | /* an http server instead of using a direct connection to the */ |
| 81 | /* host. They aren't used directly here. */ |
| 82 | /** |
| 83 | * @return if the networking layer should send ftp connections through |
| 84 | * a proxy |
| 85 | */ |
| 86 | public static boolean getUseFtpProxy() { |
| 87 | // if the ftp.proxyHost is set, use it! |
| 88 | return (getFtpProxyHost() != null); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * @return the host to use, or null if none has been specified |
| 93 | */ |
| 94 | public static String getFtpProxyHost() { |
| 95 | return java.security.AccessController.doPrivileged( |
| 96 | new java.security.PrivilegedAction<String>() { |
| 97 | public String run() { |
| 98 | String result = System.getProperty("ftp.proxyHost"); |
| 99 | if (result == null) { |
| 100 | result = System.getProperty("ftpProxyHost"); |
| 101 | } |
| 102 | if (result == null) { |
| 103 | // as a last resort we use the general one if ftp.useProxy |
| 104 | // is true |
| 105 | if (Boolean.getBoolean("ftp.useProxy")) { |
| 106 | result = System.getProperty("proxyHost"); |
| 107 | } |
| 108 | } |
| 109 | return result; |
| 110 | } |
| 111 | }); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * @return the proxy port to use. Will default reasonably if not set. |
| 116 | */ |
| 117 | public static int getFtpProxyPort() { |
| 118 | final int result[] = {80}; |
| 119 | java.security.AccessController.doPrivileged( |
| 120 | new java.security.PrivilegedAction() { |
| 121 | public Object run() { |
| 122 | |
| 123 | String tmp = System.getProperty("ftp.proxyPort"); |
| 124 | if (tmp == null) { |
| 125 | // for compatibility with 1.0.2 |
| 126 | tmp = System.getProperty("ftpProxyPort"); |
| 127 | } |
| 128 | if (tmp == null) { |
| 129 | // as a last resort we use the general one if ftp.useProxy |
| 130 | // is true |
| 131 | if (Boolean.getBoolean("ftp.useProxy")) { |
| 132 | tmp = System.getProperty("proxyPort"); |
| 133 | } |
| 134 | } |
| 135 | if (tmp != null) { |
| 136 | result[0] = Integer.parseInt(tmp); |
| 137 | } |
| 138 | return null; |
| 139 | } |
| 140 | }); |
| 141 | return result[0]; |
| 142 | } |
| 143 | |
| 144 | public static boolean matchNonProxyHosts(String host) { |
| 145 | synchronized (FtpClient.class) { |
| 146 | String rawList = java.security.AccessController.doPrivileged( |
| 147 | new sun.security.action.GetPropertyAction("ftp.nonProxyHosts")); |
| 148 | if (rawList == null) { |
| 149 | nonProxyHostsPool = null; |
| 150 | } else { |
| 151 | if (!rawList.equals(nonProxyHostsSource)) { |
| 152 | RegexpPool pool = new RegexpPool(); |
| 153 | StringTokenizer st = new StringTokenizer(rawList, "|", false); |
| 154 | try { |
| 155 | while (st.hasMoreTokens()) { |
| 156 | pool.add(st.nextToken().toLowerCase(), Boolean.TRUE); |
| 157 | } |
| 158 | } catch (sun.misc.REException ex) { |
| 159 | System.err.println("Error in http.nonProxyHosts system property: " + ex); |
| 160 | } |
| 161 | nonProxyHostsPool = pool; |
| 162 | } |
| 163 | } |
| 164 | nonProxyHostsSource = rawList; |
| 165 | } |
| 166 | |
| 167 | if (nonProxyHostsPool == null) { |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | if (nonProxyHostsPool.match(host) != null) { |
| 172 | return true; |
| 173 | } else { |
| 174 | return false; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * issue the QUIT command to the FTP server and close the connection. |
| 180 | * |
| 181 | * @exception FtpProtocolException if an error occured |
| 182 | */ |
| 183 | public void closeServer() throws IOException { |
| 184 | if (serverIsOpen()) { |
| 185 | issueCommand("QUIT"); |
| 186 | super.closeServer(); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Send a command to the FTP server. |
| 192 | * |
| 193 | * @param cmd String containing the command |
| 194 | * @return reply code |
| 195 | * |
| 196 | * @exception FtpProtocolException if an error occured |
| 197 | */ |
| 198 | protected int issueCommand(String cmd) throws IOException { |
| 199 | command = cmd; |
| 200 | |
| 201 | int reply; |
| 202 | |
| 203 | while (replyPending) { |
| 204 | replyPending = false; |
| 205 | if (readReply() == FTP_ERROR) |
| 206 | throw new FtpProtocolException("Error reading FTP pending reply\n"); |
| 207 | } |
| 208 | do { |
| 209 | sendServer(cmd + "\r\n"); |
| 210 | reply = readReply(); |
| 211 | } while (reply == FTP_TRY_AGAIN); |
| 212 | return reply; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Send a command to the FTP server and check for success. |
| 217 | * |
| 218 | * @param cmd String containing the command |
| 219 | * |
| 220 | * @exception FtpProtocolException if an error occured |
| 221 | */ |
| 222 | protected void issueCommandCheck(String cmd) throws IOException { |
| 223 | if (issueCommand(cmd) != FTP_SUCCESS) |
| 224 | throw new FtpProtocolException(cmd + ":" + getResponseString()); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Read the reply from the FTP server. |
| 229 | * |
| 230 | * @return FTP_SUCCESS or FTP_ERROR depending on success |
| 231 | * @exception FtpProtocolException if an error occured |
| 232 | */ |
| 233 | protected int readReply() throws IOException { |
| 234 | lastReplyCode = readServerResponse(); |
| 235 | |
| 236 | switch (lastReplyCode / 100) { |
| 237 | case 1: |
| 238 | replyPending = true; |
| 239 | /* falls into ... */ |
| 240 | |
| 241 | case 2: |
| 242 | case 3: |
| 243 | return FTP_SUCCESS; |
| 244 | |
| 245 | case 5: |
| 246 | if (lastReplyCode == 530) { |
| 247 | if (!loggedIn) { |
| 248 | throw new FtpLoginException("Not logged in"); |
| 249 | } |
| 250 | return FTP_ERROR; |
| 251 | } |
| 252 | if (lastReplyCode == 550) { |
| 253 | throw new FileNotFoundException(command + ": " + getResponseString()); |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | /* this statement is not reached */ |
| 258 | return FTP_ERROR; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Tries to open a Data Connection in "PASSIVE" mode by issuing a EPSV or |
| 263 | * PASV command then opening a Socket to the specified address & port |
| 264 | * |
| 265 | * @return the opened socket |
| 266 | * @exception FtpProtocolException if an error occurs when issuing the |
| 267 | * PASV command to the ftp server. |
| 268 | */ |
| 269 | protected Socket openPassiveDataConnection() throws IOException { |
| 270 | String serverAnswer; |
| 271 | int port; |
| 272 | InetSocketAddress dest = null; |
| 273 | |
| 274 | /** |
| 275 | * Here is the idea: |
| 276 | * |
| 277 | * - First we want to try the new (and IPv6 compatible) EPSV command |
| 278 | * But since we want to be nice with NAT software, we'll issue the |
| 279 | * EPSV ALL cmd first. |
| 280 | * EPSV is documented in RFC2428 |
| 281 | * - If EPSV fails, then we fall back to the older, yet OK PASV command |
| 282 | * - If PASV fails as well, then we throw an exception and the calling method |
| 283 | * will have to try the EPRT or PORT command |
| 284 | */ |
| 285 | if (issueCommand("EPSV ALL") == FTP_SUCCESS) { |
| 286 | // We can safely use EPSV commands |
| 287 | if (issueCommand("EPSV") == FTP_ERROR) |
| 288 | throw new FtpProtocolException("EPSV Failed: " + getResponseString()); |
| 289 | serverAnswer = getResponseString(); |
| 290 | |
| 291 | // The response string from a EPSV command will contain the port number |
| 292 | // the format will be : |
| 293 | // 229 Entering Extended Passive Mode (|||58210|) |
| 294 | // |
| 295 | // So we'll use the regular expresions package to parse the output. |
| 296 | |
| 297 | Pattern p = Pattern.compile("^229 .* \\(\\|\\|\\|(\\d+)\\|\\)"); |
| 298 | Matcher m = p.matcher(serverAnswer); |
| 299 | if (! m.find()) |
| 300 | throw new FtpProtocolException("EPSV failed : " + serverAnswer); |
| 301 | // Yay! Let's extract the port number |
| 302 | String s = m.group(1); |
| 303 | port = Integer.parseInt(s); |
| 304 | InetAddress add = serverSocket.getInetAddress(); |
| 305 | if (add != null) { |
| 306 | dest = new InetSocketAddress(add, port); |
| 307 | } else { |
| 308 | // This means we used an Unresolved address to connect in |
| 309 | // the first place. Most likely because the proxy is doing |
| 310 | // the name resolution for us, so let's keep using unresolved |
| 311 | // address. |
| 312 | dest = InetSocketAddress.createUnresolved(serverName, port); |
| 313 | } |
| 314 | } else { |
| 315 | // EPSV ALL failed, so Let's try the regular PASV cmd |
| 316 | if (issueCommand("PASV") == FTP_ERROR) |
| 317 | throw new FtpProtocolException("PASV failed: " + getResponseString()); |
| 318 | serverAnswer = getResponseString(); |
| 319 | |
| 320 | // Let's parse the response String to get the IP & port to connect to |
| 321 | // the String should be in the following format : |
| 322 | // |
| 323 | // 227 Entering Passive Mode (A1,A2,A3,A4,p1,p2) |
| 324 | // |
| 325 | // Note that the two parenthesis are optional |
| 326 | // |
| 327 | // The IP address is A1.A2.A3.A4 and the port is p1 * 256 + p2 |
| 328 | // |
| 329 | // The regular expression is a bit more complex this time, because the |
| 330 | // parenthesis are optionals and we have to use 3 groups. |
| 331 | |
| 332 | Pattern p = Pattern.compile("227 .* \\(?(\\d{1,3},\\d{1,3},\\d{1,3},\\d{1,3}),(\\d{1,3}),(\\d{1,3})\\)?"); |
| 333 | Matcher m = p.matcher(serverAnswer); |
| 334 | if (! m.find()) |
| 335 | throw new FtpProtocolException("PASV failed : " + serverAnswer); |
| 336 | // Get port number out of group 2 & 3 |
| 337 | port = Integer.parseInt(m.group(3)) + (Integer.parseInt(m.group(2)) << 8); |
| 338 | // IP address is simple |
| 339 | String s = m.group(1).replace(',','.'); |
| 340 | dest = new InetSocketAddress(s, port); |
| 341 | } |
| 342 | // Got everything, let's open the socket! |
| 343 | Socket s; |
| 344 | if (proxy != null) { |
| 345 | if (proxy.type() == Proxy.Type.SOCKS) { |
| 346 | s = (Socket) AccessController.doPrivileged( |
| 347 | new PrivilegedAction() { |
| 348 | public Object run() { |
| 349 | return new Socket(proxy); |
| 350 | }}); |
| 351 | } else |
| 352 | s = new Socket(Proxy.NO_PROXY); |
| 353 | } else |
| 354 | s = new Socket(); |
| 355 | if (connectTimeout >= 0) { |
| 356 | s.connect(dest, connectTimeout); |
| 357 | } else { |
| 358 | if (defaultConnectTimeout > 0) { |
| 359 | s.connect(dest, defaultConnectTimeout); |
| 360 | } else { |
| 361 | s.connect(dest); |
| 362 | } |
| 363 | } |
| 364 | if (readTimeout >= 0) |
| 365 | s.setSoTimeout(readTimeout); |
| 366 | else |
| 367 | if (defaultSoTimeout > 0) { |
| 368 | s.setSoTimeout(defaultSoTimeout); |
| 369 | } |
| 370 | return s; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * Tries to open a Data Connection with the server. It will first try a passive |
| 375 | * mode connection, then, if it fails, a more traditional PORT command |
| 376 | * |
| 377 | * @param cmd the command to execute (RETR, STOR, etc...) |
| 378 | * @return the opened socket |
| 379 | * |
| 380 | * @exception FtpProtocolException if an error occurs when issuing the |
| 381 | * PORT command to the ftp server. |
| 382 | */ |
| 383 | protected Socket openDataConnection(String cmd) throws IOException { |
| 384 | ServerSocket portSocket; |
| 385 | Socket clientSocket = null; |
| 386 | String portCmd; |
| 387 | InetAddress myAddress; |
| 388 | IOException e; |
| 389 | |
| 390 | // Let's try passive mode first |
| 391 | try { |
| 392 | clientSocket = openPassiveDataConnection(); |
| 393 | } catch (IOException ex) { |
| 394 | clientSocket = null; |
| 395 | } |
| 396 | if (clientSocket != null) { |
| 397 | // We did get a clientSocket, so the passive mode worked |
| 398 | // Let's issue the command (GET, DIR, ...) |
| 399 | try { |
| 400 | if (issueCommand(cmd) == FTP_ERROR) { |
| 401 | clientSocket.close(); |
| 402 | throw new FtpProtocolException(getResponseString()); |
| 403 | } else |
| 404 | return clientSocket; |
| 405 | } catch (IOException ioe) { |
| 406 | clientSocket.close(); |
| 407 | throw ioe; |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | assert(clientSocket == null); |
| 412 | |
| 413 | // Passive mode failed, let's fall back to the good old "PORT" |
| 414 | |
| 415 | if (proxy != null && proxy.type() == Proxy.Type.SOCKS) { |
| 416 | // We're behind a firewall and the passive mode fail, |
| 417 | // since we can't accept a connection through SOCKS (yet) |
| 418 | // throw an exception |
| 419 | throw new FtpProtocolException("Passive mode failed"); |
| 420 | } else |
| 421 | portSocket = new ServerSocket(0, 1); |
| 422 | try { |
| 423 | myAddress = portSocket.getInetAddress(); |
| 424 | if (myAddress.isAnyLocalAddress()) |
| 425 | myAddress = getLocalAddress(); |
| 426 | // Let's try the new, IPv6 compatible EPRT command |
| 427 | // See RFC2428 for specifics |
| 428 | // Some FTP servers (like the one on Solaris) are bugged, they |
| 429 | // will accept the EPRT command but then, the subsequent command |
| 430 | // (e.g. RETR) will fail, so we have to check BOTH results (the |
| 431 | // EPRT cmd then the actual command) to decide wether we should |
| 432 | // fall back on the older PORT command. |
| 433 | portCmd = "EPRT |" + |
| 434 | ((myAddress instanceof Inet6Address) ? "2" : "1") + "|" + |
| 435 | myAddress.getHostAddress() +"|" + |
| 436 | portSocket.getLocalPort()+"|"; |
| 437 | if (issueCommand(portCmd) == FTP_ERROR || |
| 438 | issueCommand(cmd) == FTP_ERROR) { |
| 439 | // The EPRT command failed, let's fall back to good old PORT |
| 440 | portCmd = "PORT "; |
| 441 | byte[] addr = myAddress.getAddress(); |
| 442 | |
| 443 | /* append host addr */ |
| 444 | for (int i = 0; i < addr.length; i++) { |
| 445 | portCmd = portCmd + (addr[i] & 0xFF) + ","; |
| 446 | } |
| 447 | |
| 448 | /* append port number */ |
| 449 | portCmd = portCmd + ((portSocket.getLocalPort() >>> 8) & 0xff) + "," |
| 450 | + (portSocket.getLocalPort() & 0xff); |
| 451 | if (issueCommand(portCmd) == FTP_ERROR) { |
| 452 | e = new FtpProtocolException("PORT :" + getResponseString()); |
| 453 | throw e; |
| 454 | } |
| 455 | if (issueCommand(cmd) == FTP_ERROR) { |
| 456 | e = new FtpProtocolException(cmd + ":" + getResponseString()); |
| 457 | throw e; |
| 458 | } |
| 459 | } |
| 460 | // Either the EPRT or the PORT command was successful |
| 461 | // Let's create the client socket |
| 462 | if (connectTimeout >= 0) { |
| 463 | portSocket.setSoTimeout(connectTimeout); |
| 464 | } else { |
| 465 | if (defaultConnectTimeout > 0) |
| 466 | portSocket.setSoTimeout(defaultConnectTimeout); |
| 467 | } |
| 468 | clientSocket = portSocket.accept(); |
| 469 | if (readTimeout >= 0) |
| 470 | clientSocket.setSoTimeout(readTimeout); |
| 471 | else { |
| 472 | if (defaultSoTimeout > 0) |
| 473 | clientSocket.setSoTimeout(defaultSoTimeout); |
| 474 | } |
| 475 | } finally { |
| 476 | portSocket.close(); |
| 477 | } |
| 478 | |
| 479 | return clientSocket; |
| 480 | } |
| 481 | |
| 482 | /* public methods */ |
| 483 | |
| 484 | /** |
| 485 | * Open a FTP connection to host <i>host</i>. |
| 486 | * |
| 487 | * @param host The hostname of the ftp server |
| 488 | * |
| 489 | * @exception FtpProtocolException if connection fails |
| 490 | */ |
| 491 | public void openServer(String host) throws IOException { |
| 492 | openServer(host, FTP_PORT); |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Open a FTP connection to host <i>host</i> on port <i>port</i>. |
| 497 | * |
| 498 | * @param host the hostname of the ftp server |
| 499 | * @param port the port to connect to (usually 21) |
| 500 | * |
| 501 | * @exception FtpProtocolException if connection fails |
| 502 | */ |
| 503 | public void openServer(String host, int port) throws IOException { |
| 504 | this.serverName = host; |
| 505 | super.openServer(host, port); |
| 506 | if (readReply() == FTP_ERROR) |
| 507 | throw new FtpProtocolException("Welcome message: " + |
| 508 | getResponseString()); |
| 509 | } |
| 510 | |
| 511 | |
| 512 | /** |
| 513 | * login user to a host with username <i>user</i> and password |
| 514 | * <i>password</i> |
| 515 | * |
| 516 | * @param user Username to use at login |
| 517 | * @param password Password to use at login or null of none is needed |
| 518 | * |
| 519 | * @exception FtpLoginException if login is unsuccesful |
| 520 | */ |
| 521 | public void login(String user, String password) throws IOException { |
| 522 | if (!serverIsOpen()) |
| 523 | throw new FtpLoginException("not connected to host"); |
| 524 | if (user == null || user.length() == 0) |
| 525 | return; |
| 526 | if (issueCommand("USER " + user) == FTP_ERROR) |
| 527 | throw new FtpLoginException("user " + user + " : " + getResponseString()); |
| 528 | /* |
| 529 | * Checks for "331 User name okay, need password." answer |
| 530 | */ |
| 531 | |
| 532 | if (lastReplyCode == 331) |
| 533 | if ((password == null) || (password.length() == 0) || |
| 534 | (issueCommand("PASS " + password) == FTP_ERROR)) |
| 535 | throw new FtpLoginException("password: " + getResponseString()); |
| 536 | |
| 537 | // keep the welcome message around so we can |
| 538 | // put it in the resulting HTML page. |
| 539 | String l; |
| 540 | StringBuffer sb = new StringBuffer(); |
| 541 | for (int i = 0; i < serverResponse.size(); i++) { |
| 542 | l = (String)serverResponse.elementAt(i); |
| 543 | if (l != null) { |
| 544 | if (l.length() >= 4 && l.startsWith("230")) { |
| 545 | // get rid of the "230-" prefix |
| 546 | l = l.substring(4); |
| 547 | } |
| 548 | sb.append(l); |
| 549 | } |
| 550 | } |
| 551 | welcomeMsg = sb.toString(); |
| 552 | loggedIn = true; |
| 553 | } |
| 554 | |
| 555 | /** |
| 556 | * GET a file from the FTP server |
| 557 | * |
| 558 | * @param filename name of the file to retrieve |
| 559 | * @return the <code>InputStream</code> to read the file from |
| 560 | * |
| 561 | * @exception FileNotFoundException if the file can't be opened |
| 562 | */ |
| 563 | public TelnetInputStream get(String filename) throws IOException { |
| 564 | Socket s; |
| 565 | |
| 566 | try { |
| 567 | s = openDataConnection("RETR " + filename); |
| 568 | } catch (FileNotFoundException fileException) { |
| 569 | /* Well, "/" might not be the file delimitor for this |
| 570 | particular ftp server, so let's try a series of |
| 571 | "cd" commands to get to the right place. */ |
| 572 | /* But don't try this if there are no '/' in the path */ |
| 573 | if (filename.indexOf('/') == -1) |
| 574 | throw fileException; |
| 575 | |
| 576 | StringTokenizer t = new StringTokenizer(filename, "/"); |
| 577 | String pathElement = null; |
| 578 | |
| 579 | while (t.hasMoreElements()) { |
| 580 | pathElement = t.nextToken(); |
| 581 | |
| 582 | if (!t.hasMoreElements()) { |
| 583 | /* This is the file component. Look it up now. */ |
| 584 | break; |
| 585 | } |
| 586 | try { |
| 587 | cd(pathElement); |
| 588 | } catch (FtpProtocolException e) { |
| 589 | /* Giving up. */ |
| 590 | throw fileException; |
| 591 | } |
| 592 | } |
| 593 | if (pathElement != null) { |
| 594 | s = openDataConnection("RETR " + pathElement); |
| 595 | } else { |
| 596 | throw fileException; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | return new TelnetInputStream(s.getInputStream(), binaryMode); |
| 601 | } |
| 602 | |
| 603 | /** |
| 604 | * PUT a file to the FTP server |
| 605 | * |
| 606 | * @param filename name of the file to store |
| 607 | * @return the <code>OutputStream</code> to write the file to |
| 608 | * |
| 609 | */ |
| 610 | public TelnetOutputStream put(String filename) throws IOException { |
| 611 | Socket s = openDataConnection("STOR " + filename); |
| 612 | TelnetOutputStream out = new TelnetOutputStream(s.getOutputStream(), binaryMode); |
| 613 | if (!binaryMode) |
| 614 | out.setStickyCRLF(true); |
| 615 | return out; |
| 616 | } |
| 617 | |
| 618 | /** |
| 619 | * Append to a file on the FTP server |
| 620 | * |
| 621 | * @param filename name of the file to append to |
| 622 | * @return the <code>OutputStream</code> to write the file to |
| 623 | * |
| 624 | */ |
| 625 | public TelnetOutputStream append(String filename) throws IOException { |
| 626 | Socket s = openDataConnection("APPE " + filename); |
| 627 | TelnetOutputStream out = new TelnetOutputStream(s.getOutputStream(), binaryMode); |
| 628 | if (!binaryMode) |
| 629 | out.setStickyCRLF(true); |
| 630 | |
| 631 | return out; |
| 632 | } |
| 633 | |
| 634 | /** |
| 635 | * LIST files in the current directory on a remote FTP server |
| 636 | * |
| 637 | * @return the <code>InputStream</code> to read the list from |
| 638 | * |
| 639 | */ |
| 640 | public TelnetInputStream list() throws IOException { |
| 641 | Socket s = openDataConnection("LIST"); |
| 642 | |
| 643 | return new TelnetInputStream(s.getInputStream(), binaryMode); |
| 644 | } |
| 645 | |
| 646 | /** |
| 647 | * List (NLST) file names on a remote FTP server |
| 648 | * |
| 649 | * @param path pathname to the directory to list, null for current |
| 650 | * directory |
| 651 | * @return the <code>InputStream</code> to read the list from |
| 652 | * @exception <code>FtpProtocolException</code> |
| 653 | */ |
| 654 | public TelnetInputStream nameList(String path) throws IOException { |
| 655 | Socket s; |
| 656 | |
| 657 | if (path != null) |
| 658 | s = openDataConnection("NLST " + path); |
| 659 | else |
| 660 | s = openDataConnection("NLST"); |
| 661 | return new TelnetInputStream(s.getInputStream(), binaryMode); |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * CD to a specific directory on a remote FTP server |
| 666 | * |
| 667 | * @param remoteDirectory path of the directory to CD to |
| 668 | * |
| 669 | * @exception <code>FtpProtocolException</code> |
| 670 | */ |
| 671 | public void cd(String remoteDirectory) throws IOException { |
| 672 | if (remoteDirectory == null || |
| 673 | "".equals(remoteDirectory)) |
| 674 | return; |
| 675 | issueCommandCheck("CWD " + remoteDirectory); |
| 676 | } |
| 677 | |
| 678 | /** |
| 679 | * CD to the parent directory on a remote FTP server |
| 680 | * |
| 681 | */ |
| 682 | public void cdUp() throws IOException { |
| 683 | issueCommandCheck("CDUP"); |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * Print working directory of remote FTP server |
| 688 | * |
| 689 | * @exception FtpProtocolException if the command fails |
| 690 | */ |
| 691 | public String pwd() throws IOException { |
| 692 | String answ; |
| 693 | |
| 694 | issueCommandCheck("PWD"); |
| 695 | /* |
| 696 | * answer will be of the following format : |
| 697 | * |
| 698 | * 257 "/" is current directory. |
| 699 | */ |
| 700 | answ = getResponseString(); |
| 701 | if (!answ.startsWith("257")) |
| 702 | throw new FtpProtocolException("PWD failed. " + answ); |
| 703 | return answ.substring(5, answ.lastIndexOf('"')); |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * Set transfer type to 'I' |
| 708 | * |
| 709 | * @exception FtpProtocolException if the command fails |
| 710 | */ |
| 711 | public void binary() throws IOException { |
| 712 | issueCommandCheck("TYPE I"); |
| 713 | binaryMode = true; |
| 714 | } |
| 715 | |
| 716 | /** |
| 717 | * Set transfer type to 'A' |
| 718 | * |
| 719 | * @exception FtpProtocolException if the command fails |
| 720 | */ |
| 721 | public void ascii() throws IOException { |
| 722 | issueCommandCheck("TYPE A"); |
| 723 | binaryMode = false; |
| 724 | } |
| 725 | |
| 726 | /** |
| 727 | * Rename a file on the ftp server |
| 728 | * |
| 729 | * @exception FtpProtocolException if the command fails |
| 730 | */ |
| 731 | public void rename(String from, String to) throws IOException { |
| 732 | issueCommandCheck("RNFR " + from); |
| 733 | issueCommandCheck("RNTO " + to); |
| 734 | } |
| 735 | |
| 736 | /** |
| 737 | * Get the "System string" from the FTP server |
| 738 | * |
| 739 | * @exception FtpProtocolException if it fails |
| 740 | */ |
| 741 | public String system() throws IOException { |
| 742 | String answ; |
| 743 | issueCommandCheck("SYST"); |
| 744 | answ = getResponseString(); |
| 745 | if (!answ.startsWith("215")) |
| 746 | throw new FtpProtocolException("SYST failed." + answ); |
| 747 | return answ.substring(4); // Skip "215 " |
| 748 | } |
| 749 | |
| 750 | /** |
| 751 | * Send a No-operation command. It's usefull for testing the connection status |
| 752 | * |
| 753 | * @exception FtpProtocolException if the command fails |
| 754 | */ |
| 755 | public void noop() throws IOException { |
| 756 | issueCommandCheck("NOOP"); |
| 757 | } |
| 758 | |
| 759 | /** |
| 760 | * Reinitialize the USER parameters on the FTp server |
| 761 | * |
| 762 | * @exception FtpProtocolException if the command fails |
| 763 | */ |
| 764 | public void reInit() throws IOException { |
| 765 | issueCommandCheck("REIN"); |
| 766 | loggedIn = false; |
| 767 | } |
| 768 | |
| 769 | /** |
| 770 | * New FTP client connected to host <i>host</i>. |
| 771 | * |
| 772 | * @param host Hostname of the FTP server |
| 773 | * |
| 774 | * @exception FtpProtocolException if the connection fails |
| 775 | */ |
| 776 | public FtpClient(String host) throws IOException { |
| 777 | super(); |
| 778 | openServer(host, FTP_PORT); |
| 779 | } |
| 780 | |
| 781 | /** |
| 782 | * New FTP client connected to host <i>host</i>, port <i>port</i>. |
| 783 | * |
| 784 | * @param host Hostname of the FTP server |
| 785 | * @param port port number to connect to (usually 21) |
| 786 | * |
| 787 | * @exception FtpProtocolException if the connection fails |
| 788 | */ |
| 789 | public FtpClient(String host, int port) throws IOException { |
| 790 | super(); |
| 791 | openServer(host, port); |
| 792 | } |
| 793 | |
| 794 | /** Create an uninitialized FTP client. */ |
| 795 | public FtpClient() {} |
| 796 | |
| 797 | public FtpClient(Proxy p) { |
| 798 | proxy = p; |
| 799 | } |
| 800 | |
| 801 | protected void finalize() throws IOException { |
| 802 | /** |
| 803 | * Do not call the "normal" closeServer() as we want finalization |
| 804 | * to be as efficient as possible |
| 805 | */ |
| 806 | if (serverIsOpen()) |
| 807 | super.closeServer(); |
| 808 | } |
| 809 | |
| 810 | } |